Williams Coal Seam Gas Royalty Trust (WTU) 10-K 2006 FY Annual report

Exhibit 99.3

January 31, 2007

Mr. Ron E. Hooper
Senior Vice President
Bank of America, N.A., Trustee
Williams Coal Seam Gas Royalty Trust
901 Main Street, Suite 1700
Dallas, Texas 75201

Re:	Williams Coal Seam Gas Royalty Trust
	Proved Reserves and Future Net Revenues
	As of December 31, 2006

Dear Mr. Hooper:

     At your request, we estimated the proved reserves and projected the future net revenues from the gas reserves in the Fruitland Coal Formation that are attributable to the subject interests of the Williams Coal Seam Gas Royalty Trust (“WTU”). These interests consist of net profits interests in natural gas properties located in the San Juan Basin in Colorado and New Mexico.

     A summary of the reserves for the Underlying Properties and Royalty Interests (net to the Trust) is as follows:

	Net Gas		Future Net		Present Value
	Reserves,		Revenues,		at 10 Percent
	MMcf		M$		Per Annum, M$
The Underlying Properties
Proved Developed		81,161		221,550		160,143
Proved Undeveloped		8,580		12,349		5,030
Total Proved		89,741		233,899		165,173
The Royalty Interests (Net to the Trust)
Proved Developed		23,557		53,871		32,786
Proved Undeveloped		711		1,918		903
Total Proved		24,267		55,789		33,689

Mr. Ron E. Hooper
Bank of America, N.A., Trustee
Williams Coal Seam Gas Royalty Trust January 31, 2007
Page 2

     In order to estimate the reserves to the WTU, it was necessary to estimate the reserves attributable to (i) the “Underlying Properties,” which are certain working interest properties (“Working Interest Properties”) and net profits interests properties (“Farmout Properties”) that are managed by Williams Production Company (“WPC”) and (ii) the “Royalty Interests,” the variable net revenue interest conveyed to WTU by WPC. WTU receives a “Specified Percentage” of “Net Proceeds” from gas produced and sold from the Working Interest Properties and from the revenue stream of the Farmout Properties. Currently, for 320-acre spaced wells in the Working Interest Properties, and all wells in the Farmout Properties, the percentage of net proceeds is 60 percent.

     For the Working Interest Properties, overhead costs (beyond the standard overhead charges for the non-operated properties) have not been included, nor have the effects of depreciation, depletion, and Federal Income Tax. Net Proceeds is defined as revenues derived from the sale of Working Interest Properties gas volumes less severance and ad valorem taxes, lease royalty payments, and operating expenses in excess of the estimates shown in Exhibit B of the Trust Conveyance. The reserves attributable to the Royalty Interests from the Working Interest Properties were computed by multiplying the net gas reserves of the Working Interest Properties by the ratio of (i) the net revenue received by WTU from the Working Interest Properties to (ii) total revenues from the Working Interest Properties after deduction of severance and ad valorem taxes.

     The proved reserves were estimated in accordance with the definitions contained in Securities and Exchange Commission Regulation S-X, Rule 4-10(a). Estimates of future net revenues and discounted future net revenues are not intended and should not be interpreted to represent the fair market value of the estimated reserves.

     The production forecast for the total proved reserves and future net revenues as of December 31, 2006 attributable to the Underlying Properties and to the WTU are shown on Table 1. Forecasts for proved developed reserves and proved undeveloped reserves are shown on Tables 2 and 3. The proved reserves and future net revenues as of December 31, 2006 attributable to the individual Underlying Properties are shown on the attached one-line summary identified as Table 4.

     The gas reserves for the Fruitland Coal were primarily estimated by decline curve analyses utilizing type curves for the various areas in the San Juan Basin. These type curves were developed for each area and were based on production histories and the initial reservoir pressures of the wells in the separate areas.

     In October 2002, the field rules for the Basin Fruitland Coal Gas Pool in New Mexico were revised to allow an optional second (infill) well on the standard 320-acre spacing unit in certain designated areas of the pool. As of July 2003, the field rules were further modified to allow such infill drilling in all areas of the pool. The Working Interest Properties contain 406 developed infill locations and 116 additional infill locations that are evaluated as containing proved undeveloped reserves. The Trust provides for an infill NPI, a net profits interest that entitles the Trust to receive 20 percent of the Infill Net Proceeds. Infill Net Proceeds is determined on an aggregate basis, not on a well-by-well basis. According to the estimates of WPC, the infill drilling program will pay out, and the Trust will start to receive net proceeds in 2008.

Mr. Ron E. Hooper
Bank of America, N.A., Trustee
Williams Coal Seam Gas Royalty Trust January 31, 2007
Page 3

     The gas prices and deductions for WTU are based upon information provided by WPC. The gas price for the Farmout Properties is $5.470 per MMBtu based on the December 31, 2006 Blanco Hub Index Price. For the Working Interest Properties, the adjusted price of $3.735 per MMBtu was employed as provided for in the Gas Purchase Contract. On December 31, 2012, the WTU terminates and the Gas Purchase Contract is no longer in effect. The gas price reverts to $5.470 per MMBtu, based on the December 31, 2006 Blanco Hub Index Price. Gathering and transportation charges, taxes, treating, and other costs payable prior to the delivery points were deducted from the index price in order to determine the net wellhead price used in this evaluation. These prices and deductions were held constant.

     Deductions for lease royalty and production and ad valorem taxes for the Working Interest Properties were based on the December 31, 2006 index gas price of $5.470 per MMBtu less appropriate deductions as reported by WPC.

     Operating expense estimates were based on expenses incurred during 2006 and were not escalated. Where appropriate, estimated operating expenses which exceeded the operating expenses in Exhibit B to the Conveyance were deducted in calculating Net Proceeds and, therefore, reduced the amounts payable to the WTU.

     In preparation of our estimates, we relied on production histories, accounting and cost data, engineering and geological information supplied by WPC, and data from public records. The ownership interests evaluated herein were provided by WPC and were employed as presented. No independent verification of these interests was made by Miller and Lents, Ltd.

     Capital expenditures to plug and abandon wells are considered to be equal to the salvage values of the wells at the time of abandonment. We did not include any consideration for the future environmental restoration that might be required as such was beyond the scope of our assignment. In our projection of future net revenues, no provisions are made for production prepayments or for the consequences of future production balancing. As instructed, we assumed for purposes of this report that the Trust will continue as long as there is economic production from the contributing properties.

     The evaluations presented in this report, with the exceptions of those parameters specified by others, reflect our informed judgments based on accepted standards of professional investigation but are subject to those generally recognized uncertainties associated with interpretation of geological and engineering information. Government policies and market conditions different from those employed in this study may cause the total quantity of oil or gas to be recovered, actual production rates, prices received, and operating and capital costs to vary from those presented in this report. Minor precision inconsistencies in subtotals or totals may exist in the report due to truncation or rounding of aggregated values.

     Miller and Lents, Ltd. is an independent oil and gas consulting firm. No director, officer, or key employee of Miller and Lents, Ltd. has any financial ownership in WTU or WPC or any related company. Our compensation for the required investigations and preparation of this report is not contingent on the results obtained and reported, and we have not performed other work that would affect our objectivity.

Mr. Ron E. Hooper
Bank of America, N.A., Trustee
Williams Coal Seam Gas Royalty Trust January 31, 2007
Page 4

Production of this report was supervised by an officer of the firm who is a professionally qualified and licensed Professional Engineer in the State of Texas with more than 20 years of relevant experience in the estimation, assessment, and evaluation of oil and gas reserves.

Very truly yours, MILLER AND LENTS, LTD.
By	/s/ Stephen M. Hamburg
	Stephen M. Hamburg
	Vice President

SMH/jj

WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMICS AS OF DECEMBER 31, 2006
UNDERLYING PROPERTIES AND TRUST INTERESTS

NON-ESCALATED 12/31/2006 PRICES
TOTAL PROVED RESERVES

	Underlying Properties																				Trust Interests
	Natural Gas, MMCF						Revenue		Net Oper Costs, M$						Future Net Revenue, M$				Tax Credits, M$				Future Net Revenue, M$				Tax Credits, M$
					Price		to Net Intr		Oper		Adv&Sev		Future				Disc			Disc	Net				Disc			Disc
Year	Gross		Net		$/Mcf		M$		Expns		Taxes		Capital		Annual		@10%		Annual	@10%	MMCF		Annual		@10%		Annual	@10%
2007		200,940		17,295		3.619		62,583		6,110		6,449		7,007		43,017		40,985				4,021		7,368		7,022
2008		165,223		14,275		3.619		51,661		5,320		5,326		2,349		38,666		33,604				3,329		6,093		5,262
2009		135,395		11,508		3.618		41,635		4,552		4,288		1,462		31,333		24,776				2,835		5,166		4,043
2010		110,341		9,269		3.617		33,525		3,919		3,449		347		25,811		18,574				2,357		4,284		3,043
2011		88,364		7,397		3.615		26,740		3,375		2,746		—		20,619		13,494				1,909		3,480		2,239
2012		70,636		5,913		3.613		21,362		2,936		2,189		—		16,237		9,660				1,510		2,765		1,613
2013		56,655		4,743		3.611		17,128		2,578		1,752		—		12,798		6,923				1,747		5,622		2,960
2014		45,579		3,819		3.609		13,784		2,286		1,408		—		10,090		4,962				1,393		4,479		2,136
2015		36,753		3,084		3.607		11,124		2,043		1,134		—		7,947		3,553				1,109		3,565		1,540
2016		29,694		2,494		3.606		8,992		1,827		916		—		6,250		2,540				883		2,834		1,110
2017		24,008		2,018		3.604		7,272		1,629		739		—		4,904		1,812				701		2,248		798
2018		19,394		1,634		3.602		5,886		1,454		597		—		3,835		1,289				555		1,778		572
2019		15,656		1,322		3.600		4,758		1,289		482		—		2,987		913				438		1,401		408
2020		12,645		1,069		3.599		3,845		1,144		389		—		2,313		642				344		1,098		290
2021		10,199		861		3.596		3,097		1,004		312		—		1,781		450				269		858		206
2022		8,132		691		3.593		2,482		873		250		—		1,360		312				209		666		145
2023		6,450		553		3.591		1,986		758		199		—		1,029		214				161		513		101
2024		4,969		425		3.587		1,526		610		152		—		763		145				123		391		70
2025		3,733		322		3.580		1,154		478		115		—		561		96				94		296		48
2026		2,785		243		3.572		868		368		85		—		415		66				71		225		33
AFTER		8,581		807		3.571		2,881		1,414		283		—		1,183		163				210		659		51
TOTAL		1,056,132		89,741		3.614		324,290		45,965		33,262		11,164		233,899		165,173				24,267		55,789		33,689

DATE: 12/31/2006 This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report. TABLE 1

WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMICS AS OF DECEMBER 31, 2006
UNDERLYING PROPERTIES AND TRUST INTERESTS

NON-ESCALATED 12/31/2006 PRICES
TOTAL PROVED DEVELOPED RESERVES

	Underlying Properties																				Trust Interests
	Natural Gas, MMCF						Revenue		Net Oper Costs, M$						Future Net Revenue, M$				Tax Credits, M$				Future Net Revenue, M$				Tax Credits, M$
					Price		to Net Intr		Oper		Adv&Sev		Future				Disc			Disc	Net				Disc			Disc
Year	Gross		Net		$/Mcf		M$		Expns		Taxes		Capital		Annual		@10%		Annual	@10%	MMCF		Annual		@10%		Annual	@10%
2007		197,290		16,947		3.617		61,303		5,982		6,310		—		49,011		46,836				4,021		7,368		7,022
2008		153,545		13,187		3.614		47,656		4,911		4,890		—		37,856		32,885				3,329		6,093		5,262
2009		120,349		10,330		3.611		37,300		4,095		3,816		—		29,389		23,208				2,835		5,166		4,043
2010		94,930		8,144		3.608		29,385		3,467		2,998		—		22,920		16,454				2,282		4,168		2,956
2011		75,275		6,458		3.605		23,282		2,976		2,369		—		17,937		11,706				1,814		3,326		2,138
2012		59,980		5,146		3.603		18,542		2,588		1,882		—		14,072		8,348				1,435		2,643		1,541
2013		47,979		4,118		3.601		14,828		2,271		1,502		—		11,055		5,962				1,644		5,283		2,776
2014		38,514		3,309		3.598		11,908		2,013		1,204		—		8,691		4,262				1,310		4,206		2,002
2015		31,000		2,668		3.596		9,594		1,798		968		—		6,829		3,044				1,043		3,347		1,443
2016		25,008		2,155		3.594		7,744		1,605		780		—		5,360		2,172				830		2,660		1,039
2017		20,191		1,741		3.592		6,253		1,425		628		—		4,200		1,547				659		2,111		747
2018		16,285		1,408		3.590		5,055		1,265		507		—		3,284		1,100				522		1,671		536
2019		13,123		1,137		3.587		4,080		1,113		408		—		2,560		780				413		1,318		383
2020		10,581		918		3.585		3,292		977		328		—		1,986		550				324		1,035		273
2021		8,518		739		3.582		2,646		846		263		—		1,537		387				254		811		194
2022		6,815		594		3.579		2,125		729		211		—		1,184		271				199		632		137
2023		5,418		476		3.576		1,701		625		168		—		907		189				154		490		96
2024		4,239		374		3.574		1,336		515		132		—		689		131				119		377		67
2025		3,278		291		3.570		1,039		417		102		—		520		89				91		289		47
2026		2,550		228		3.565		814		338		80		—		396		63				70		222		32
AFTER		8,391		794		3.569		2,833		1,387		278		—		1,167		161				209		657		51
TOTAL		943,256		81,161		3.607		292,716		41,343		29,823		—		221,550		160,143				23,557		53,871		32,786

DATE: 12/31/2006 This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report. TABLE 2

WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMICS AS OF DECEMBER 31, 2006
UNDERLYING PROPERTIES AND TRUST INTERESTS

NON-ESCALATED 12/31/2006 PRICES
TOTAL PROVED UNDEVELOPED RESERVES

	Underlying Properties																						Trust Interests
	Natural Gas, MMCF						Revenue		Net Oper Costs, M$						Future Net Revenue, M$						Tax Credits, M$				Future Net Revenue, M$				Tax Credits, M$
					Price		to Net Intr		Oper		Adv&Sev		Future					Disc				Disc	Net				Disc			Disc
Year	Gross		Net		$/Mcf		M$		Expns		Taxes		Capital		Annual			@10%			Annual	@10%	MMCF		Annual		@10%		Annual	@10%
2007		3,650		348		3.680		1,280		128		139		7,007		(5,994	)		(5,852	)				—		—		—
2008		11,679		1,088		3.680		4,005		409		436		2,349		810			719					—		—		—
2009		15,046		1,178		3.680		4,334		457		472		1,462		1,944			1,568					—		—		—
2010		15,411		1,125		3.680		4,141		452		451		347		2,891			2,120					75		116		87
2011		13,089		940		3.680		3,459		400		377		—		2,683			1,788					95		154		101
2012		10,656		767		3.680		2,821		348		307		—		2,165			1,312					75		122		72
2013		8,676		625		3.680		2,300		307		251		—		1,743			960					104		340		183
2014		7,065		510		3.680		1,876		273		204		—		1,399			701					83		273		134
2015		5,754		416		3.680		1,530		245		167		—		1,119			509					66		218		97
2016		4,686		339		3.680		1,248		222		136		—		890			368					53		173		70
2017		3,817		277		3.681		1,019		204		111		—		704			265					42		137		50
2018		3,110		226		3.680		831		189		91		—		552			189					33		107		36
2019		2,534		184		3.679		678		177		74		—		428			133					25		83		25
2020		2,064		150		3.680		553		167		60		—		327			92					19		63		17
2021		1,681		123		3.678		451		158		49		—		244			63					14		47		12
2022		1,318		97		3.681		358		143		39		—		175			41					10		34		8
2023		1,032		77		3.683		285		132		31		—		121			26					7		23		5
2024		731		52		3.679		190		96		21		—		74			14					4		14		3
2025		455		31		3.678		114		62		12		—		40			7					2		8		1
2026		234		15		3.667		54		29		6		—		19			3					1		4		1
AFTER		190		13		3.700		48		27		5		—		16			2					1		3		0
TOTAL		112,876		8,580		3.680		31,574		4,622		3,439		11,164		12,349			5,030					711		1,918		903

DATE: 12/31/2006 This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report. TABLE 3

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
STATE: COLORADO
PROVED DEVELOPED RESERVES
HENDRICKSON GU B #1 (NPI)		13385	NON-UNIT		32N10W20		1		27		1,612		494		1,381		0		0		0		1,381		870		12
SO UTE TRIBAL I 2 (NPI)		13389	NON-UNIT		32N10W07		1		16		933		286		800		0		0		0		800		596		17
SO UTE TRIBAL J #2 (NPI)		13390	NON-UNIT		32N10W07		1		22		991		304		850		0		0		0		850		568		22
TOTAL PROVED DEVELOPED: 160-Acre Colorado							3				3,537		1,083		3,031		0		0		0		3,031		2,035
CARTER UTE #101 (NPI)		14449	NON-UNIT		32N10W12		1		23		2,418		93		259		0		0		0		259		180		6
CARTER UTE #106 (NPI)		13397	NON-UNIT		32N10W11		1		17		1,246		95		267		0		0		0		267		199		16
CARTER UTE #107(NPI)		13398	NON-UNIT		32N10W13		1		18		1,180		113		316		0		0		0		316		229		14
CLARK CUMMINS GU A #1 (NPI)		13383	NON-UNIT		32N10W19		1		32		2,479		750		2,098		0		0		0		2,098		1,281		13
HENDRICKSON GU A #1 (NPI)		13384	NON-UNIT		32N10W20		1		18		711		215		601		0		0		0		601		423		11
J B GARDNER GU A #1 (NPI)		13386	NON-UNIT		32N10W22		1		25		2,162		449		1,256		0		0		0		1,256		841		18
MONTGOMERY, M H #9 (NPI)		15248	NON-UNIT		32N10W12		1		28		3,161		605		1,693		0		0		0		1,693		1,116		15
ROBIN FRAZIER GU A #1 (NPI)		13387	NON-UNIT		32N10W23		1		17		1,316		261		731		0		0		0		731		547		19
SO UTE 10-3, 32-10 (NPI)		13399	NON-UNIT		32N10W10		1		24		2,359		361		1,011		0		0		0		1,011		693		21
SO UTE 15-3, 32-10 (NPI)		13400	NON-UNIT		32N10W15		1		31		2,860		219		613		0		0		0		613		385		9
SO UTE 16-2, 32-10 (NPI)		13401	NON-UNIT		32N10W16		1		25		2,320		266		746		0		0		0		746		501		10
SO UTE TRIBAL H #2 (NPI)		13388	NON-UNIT		32N10W18		1		19		969		297		831		0		0		0		831		581		2
SO UTE TRIBAL KK #1 (NPI)		13391	NON-UNIT		32N10W07		1		20		854		261		731		0		0		0		731		497		3
SO UTE TRIBAL LL #1 (NPI)		13392	NON-UNIT		32N10W08		1		21		1,197		367		1,026		0		0		0		1,026		704		4
SO UTE TRIBAL MM #1 (NPI)		13393	NON-UNIT		32N10W08		1		24		1,568		480		1,343		0		0		0		1,343		887		7
SO UTE TRIBAL NN #1 (NPI)		13394	NON-UNIT		32N10W17		1		17		857		262		734		0		0		0		734		528		5
SO UTE TRIBAL OO #1 (NPI)		13395	NON-UNIT		32N10W18		1		13		460		141		394		0		0		0		394		298		8
SO UTE TRIBAL SS #1 (NPI)		13396	NON-UNIT		32N10W21		1		24		1,438		440		1,232		0		0		0		1,232		813		20
TOTAL PROVED DEVELOPED: 320-Acre Colorado							18				29,556		5,676		15,882		0		0		0		15,882		10,705
TOTAL PROVED DEVELOPED: COLORADO							21				33,093		6,760		18,913		0		0		0		18,913		12,740
TOTAL PROVED RESERVES: COLORADO							21				33,093		6,760		18,913		0		0		0		18,913		12,740
STATE: NEW MEXICO
PROVED DEVELOPED RESERVES
ALLISON UNIT COM #105S		5141	SJ 32-7		32N07W15		1		16		690		29		108		19		12		0		77		57		1390
ALLISON UNIT COM #146S		5266	SJ 32-7		32N07W24		1		8		362		31		113		19		12		0		81		69		1391
BLANCO #201A		5609	NON-UNIT		31N08W35		1		13		802		118		436		64		47		0		324		256		1168
BLANCO #202A		5607	NON-UNIT		31N08W26		1		6		177		26		96		20		10		0		65		57		1166
BLANCO #203A		5610	NON-UNIT		31N08W35		1		13		381		56		207		45		23		0		139		106		1233
BLANCO #204A		5608	NON-UNIT		31N08W26		1		10		296		44		161		35		17		0		108		87		1165

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 1 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
BLANCO #330S		5559	NON-UNIT		31N08W05		1		12		842		61		226		31		25		0		170		138		1132
BONDS COM #100S		5140	NON-UNIT		32N10W15		1		14		779		39		143		21		16		0		106		83		1006
CAT DRAW COM #101S		20071	SJ 30-5		30N05W34		1		15		1,265		60		220		28		24		0		168		130		1467
DECKER GAS COM A #1S		5840	NON-UNIT		32N10W17		1		10		187		14		50		15		5		0		30		24		1133
EAGLE #750S		5995	NON-UNIT		32N09W16		1		13		1,172		23		85		10		9		0		66		53		1179
HUERFANO UNIT #79		12186	HUERFANO		27N10W31		1		8		185		26		96		24		10		0		62		50		1268
JAQUEZ #331S		5582	NON-UNIT		31N08W07		1		13		871		67		245		32		27		0		186		147		1136
MIDDLE MESA COM #3S		4769	SJ 32-7		32N07W06		1		12		829		36		133		18		15		0		100		81		1386
MOORE, WAYNE COM #2S		5268	NON-UNIT		31N09W16		1		9		186		7		25		7		3		0		16		13		1034
NE BLANCO UNIT #400A		1809	NEBU		31N06W07		1		14		781		6		22		3		2		0		17		13		1290
NE BLANCO UNIT #401A		5317	NEBU		30N07W09		1		11		647		5		19		2		2		0		14		11		834
NE BLANCO UNIT #402A		5145	NEBU		30N07W05		1		19		1,047		8		30		4		3		0		23		16		1007
NE BLANCO UNIT #403A		5191	NEBU		30N07W09		1		13		631		5		18		3		2		0		13		11		767
NE BLANCO UNIT #406A		5192	NEBU		31N07W22		1		2		10		0		0		0		0		0		0		0		1008
NE BLANCO UNIT #407A		17895	NEBU		30N07W21		1		16		335		3		10		2		1		0		6		4		695
NE BLANCO UNIT #408A		5196	NEBU		31N07W20		1		11		161		1		5		1		1		0		3		2		1215
NE BLANCO UNIT #409A		5273	NEBU		30N07W10		1		10		474		4		14		2		1		0		10		8		835
NE BLANCO UNIT #410A		17897	NEBU		31N07W09		1		16		1,422		11		41		5		4		0		32		24		668
NE BLANCO UNIT #411A		5200	NEBU		30N07W10		1		13		585		5		17		2		2		0		12		10		768
NE BLANCO UNIT #412A		5802	NEBU		31N07W29		1		14		1,030		8		29		3		3		0		23		18		1310
NE BLANCO UNIT #413A		17899	NEBU		30N07W20		1		9		278		2		8		1		1		0		6		5		692
NE BLANCO UNIT #415A		5207	NEBU		30N07W02		1		15		589		5		17		3		2		0		12		9		769
NE BLANCO UNIT #418A		5210	NEBU		31N07W28		1		18		888		7		25		4		3		0		19		14		1217
NE BLANCO UNIT #422A		5146	NEBU		31N07W20		1		9		263		2		8		1		1		0		5		4		1011
NE BLANCO UNIT #425A		6038	NEBU		30N07W08		1		16		800		6		23		3		2		0		17		12		826
NE BLANCO UNIT #426A		5231	NEBU		31N06W06		1		12		570		4		16		2		2		0		12		10		1219
NE BLANCO UNIT #428A		6018	NEBU		31N07W24		1		16		901		7		26		3		3		0		20		14		1048
NE BLANCO UNIT #430A		5245	NEBU		30N07W05		1		11		362		3		10		2		1		0		7		6		1013
NE BLANCO UNIT #433A		1000	NEBU		30N07W19		1		15		488		4		14		3		2		0		10		7		1208
NE BLANCO UNIT #434A		6017	NEBU		31N07W23		1		11		552		4		16		2		2		0		12		10		1045
NE BLANCO UNIT #435A		4894	NEBU		30N08W01		1		19		1,355		11		39		5		4		0		30		22		999
NE BLANCO UNIT #436A		1149	NEBU		31N06W19		1		17		845		7		24		3		3		0		18		13		1004
NE BLANCO UNIT #437A		5251	NEBU		30N08W12		1		17		781		6		22		3		2		0		17		12		1015
NE BLANCO UNIT #438A		1160	NEBU		31N06W18		1		11		943		7		27		3		3		0		21		18		1000
NE BLANCO UNIT #439A		5169	NEBU		30N08W13		1		11		644		5		18		2		2		0		14		11		1016
NE BLANCO UNIT #440A		709	NEBU		31N07W11		1		18		1,494		12		43		5		5		0		33		25		1207
NE BLANCO UNIT #441A		1545	NEBU		30N08W24		1		14		661		5		19		3		2		0		14		11		735
NE BLANCO UNIT #442A		17900	NEBU		31N07W11		1		21		2,208		17		63		7		7		0		50		36		666
NE BLANCO UNIT #443A		17896	NEBU		30N08W24		1		5		37		0		1		1		0		0		0		0		689
NE BLANCO UNIT #445A		5250	NEBU		31N08W25		1		16		765		6		22		3		2		0		16		12		1017
NE BLANCO UNIT #447A		5248	NEBU		31N08W36		1		17		1,043		8		30		4		3		0		23		17		1018

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 2 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
NE BLANCO UNIT #448A		5181	NEBU		31N07W32		1		13		368		3		11		2		1		0		7		6		1019
NE BLANCO UNIT #449A		5183	NEBU		31N07W19		1		18		1,486		12		43		5		5		0		33		25		1020
NE BLANCO UNIT #450A		5801	NEBU		31N07W32		1		11		731		6		21		3		2		0		16		13		1056
NE BLANCO UNIT #451A		6035	NEBU		30N07W06		1		12		694		5		20		3		2		0		15		12		1037
NE BLANCO UNIT #452A		5797	NEBU		31N07W15		1		18		1,418		11		41		5		4		0		31		23		1041
NE BLANCO UNIT #454A		6025	NEBU		31N07W33		1		12		1,082		8		31		3		3		0		24		20		1057
NE BLANCO UNIT #455A		5190	NEBU		31N07W31		1		12		1,240		10		35		4		4		0		28		23		1021
NE BLANCO UNIT #457A		5189	NEBU		31N07W30		1		12		966		8		28		3		3		0		21		18		1022
NE BLANCO UNIT #458A		5247	NEBU		31N07W13		1		13		1,166		9		33		4		4		0		26		21		1023
NE BLANCO UNIT #460A		1810	NEBU		31N06W07		1		10		598		5		17		2		2		0		13		11		753
NE BLANCO UNIT #461A		5182	NEBU		30N07W07		1		13		517		4		15		2		2		0		11		9		1024
NE BLANCO UNIT #462A		5246	NEBU		31N07W01		1		4		96		1		3		1		0		0		2		2		1025
NE BLANCO UNIT #463A		5170	NEBU		30N07W18		1		12		452		4		13		2		1		0		9		7		1213
NE BLANCO UNIT #464A		17898	NEBU		31N07W10		1		17		943		7		27		4		3		0		20		15		667
NE BLANCO UNIT #465A		5243	NEBU		30N08W01		1		12		741		6		21		3		2		0		16		13		1027
NE BLANCO UNIT #468A		5163	NEBU		31N07W35		1		17		1,159		9		33		4		4		0		25		19		772
NE BLANCO UNIT #471A		5272	NEBU		31N08W25		1		12		770		6		22		3		2		0		17		14		1064
NE BLANCO UNIT #476A		5799	NEBU		31N07W22		1		19		1,064		8		30		4		3		0		23		16		1044
NE BLANCO UNIT #478A		5212	NEBU		31N07W21		1		12		371		3		11		2		1		0		7		6		1218
NE BLANCO UNIT #480A		5209	NEBU		31N07W14		1		21		796		6		23		4		2		0		17		11		1029
NE BLANCO UNIT #481A		5153	NEBU		31N07W36		1		8		586		5		17		2		2		0		13		11		773
NE BLANCO UNIT #482A		4895	NEBU		31N07W15		1		13		870		7		25		3		3		0		19		15		1002
NE BLANCO UNIT #483A		5149	NEBU		31N07W36		1		16		632		5		18		3		2		0		13		10		774
NE BLANCO UNIT #484A		4896	NEBU		31N07W16		1		15		1,106		9		32		4		3		0		24		19		1003
NE BLANCO UNIT #486A		1150	NEBU		31N06W19		1		14		1,209		9		35		4		4		0		27		21		717
NE BLANCO UNIT #487A		5201	NEBU		31N07W35		1		5		65		1		2		1		0		0		1		1		1030
NE BLANCO UNIT #490A		5198	NEBU		31N07W14		1		7		193		2		6		1		1		0		4		3		1216
NE BLANCO UNIT #491A		5147	NEBU		31N07W25		1		13		528		4		15		2		2		0		11		9		1212
NE BLANCO UNIT #492A		5795	NEBU		31N07W12		1		10		262		2		8		2		1		0		5		4		1038
NE BLANCO UNIT #493A		6012	NEBU		31N07W25		1		18		951		7		27		4		3		0		21		14		830
NE BLANCO UNIT #495A		1068	NEBU		31N06W30		1		13		348		3		10		2		1		0		7		5		754
NE BLANCO UNIT #496A		1161	NEBU		31N06W18		1		12		957		7		27		3		3		0		21		17		720
NE BLANCO UNIT #497A		1110	NEBU		31N06W30		1		8		179		1		5		1		1		0		3		3		713
NE BLANCO UNIT #498A		5193	NEBU		31N07W13		1		19		1,350		11		39		5		4		0		30		22		1214
NE BLANCO UNIT #499A		1152	NEBU		31N06W20		1		17		1,913		15		55		6		6		0		43		33		731
NE BLANCO UNIT #500A		1157	NEBU		31N06W20		1		15		1,072		8		31		4		3		0		24		18		1209
NE BLANCO UNIT #504A		1163	NEBU		31N07W16		1		11		1,191		9		34		4		4		0		27		22		738
PAYNE #201S		4128	NON-UNIT		32N10W20		1		19		1,075		20		73		11		8		0		54		38		743
QUINN #336S		5596	NON-UNIT		31N08W17		1		11		734		54		198		28		22		0		148		120		1135
RATTLESNAKE CANYON #105S		4771	SJ 32-8		32N08W32		1		17		1,903		81		298		35		33		0		231		178		1388
SAN JUAN 28-6 UNIT #418S		19353	SJ 28-6		28N06W28		1		11		113		6		24		11		3		0		10		8		639

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 3 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 28-6 UNIT #437S		6102	SJ 28-6		28N06W28		1		8		149		8		31		9		3		0		19		15		1344
SAN JUAN 28-6 UNIT #467S		12609	SJ 28-6		28N06W34		1		2		19		1		4		2		0		0		2		2		1367
SAN JUAN 28-6 UNIT #474S		12616	SJ 28-6		28N06W27		1		6		101		6		21		6		2		0		12		11		1369
SAN JUAN 28-6 UNIT #475S		12610	SJ 28-6		28N06W29		1		9		196		11		41		10		4		0		26		21		1419
SAN JUAN 29-6 UNIT #201A		5403	SJ 29-6		29N06W06		1		15		450		59		217		44		24		0		149		111		740
SAN JUAN 29-6 UNIT #202A		5404	SJ 29-6		29N06W06		1		9		115		15		56		20		6		0		29		24		739
SAN JUAN 29-6 UNIT #203A		5406	SJ 29-6		29N06W07		1		8		389		51		188		30		20		0		137		116		816
SAN JUAN 29-6 UNIT #204A		5405	SJ 29-6		29N06W07		1		16		534		70		257		49		28		0		180		132		745
SAN JUAN 29-6 UNIT #205A		6095	SJ 29-6		29N06W21		1		15		1,030		135		497		66		54		0		376		291		926
SAN JUAN 29-6 UNIT #207A		5555	SJ 29-6		29N06W02		1		16		765		100		369		59		40		0		270		199		817
SAN JUAN 29-6 UNIT #208A		5551	SJ 29-6		29N06W17		1		11		219		29		106		28		11		0		66		51		995
SAN JUAN 29-6 UNIT #209A		5552	SJ 29-6		29N06W17		1		17		876		115		422		65		46		0		312		229		994
SAN JUAN 29-6 UNIT #210A		6093	SJ 29-6		29N06W20		1		12		703		92		339		48		37		0		254		206		924
SAN JUAN 29-6 UNIT #211A		6094	SJ 29-6		29N06W20		1		14		323		42		156		38		17		0		101		75		923
SAN JUAN 29-6 UNIT #214A		5407	SJ 29-6		29N06W03		1		16		684		90		330		55		36		0		239		177		818
SAN JUAN 29-6 UNIT #215A		5408	SJ 29-6		29N06W03		1		19		1,408		184		679		89		74		0		516		375		775
SAN JUAN 29-6 UNIT #216A		5410	SJ 29-6		29N06W04		1		14		751		98		362		55		39		0		268		207		742
SAN JUAN 29-6 UNIT #217A		5411	SJ 29-6		29N06W05		1		12		380		50		183		37		20		0		127		98		741
SAN JUAN 29-6 UNIT #218A		5412	SJ 29-6		29N06W05		1		2		17		2		8		4		1		0		4		3		905
SAN JUAN 29-6 UNIT #220A		6081	SJ 29-6		29N06W11		1		11		669		88		323		46		35		0		242		198		912
SAN JUAN 29-6 UNIT #221A		6082	SJ 29-6		29N06W11		1		6		82		11		40		13		4		0		22		19		911
SAN JUAN 29-6 UNIT #236A		5553	SJ 29-6		29N06W18		1		12		262		34		126		31		14		0		81		63		819
SAN JUAN 29-6 UNIT #237A		5110	SJ 29-6		29N06W01		1		12		271		36		131		32		14		0		84		65		757
SAN JUAN 29-6 UNIT #238A		5033	SJ 29-6		29N06W01		1		6		122		16		59		16		6		0		37		32		734
SAN JUAN 29-6 UNIT #239A		5616	SJ 29-6		29N06W02		1		16		442		58		213		45		23		0		144		105		903
SAN JUAN 29-6 UNIT #240A		6078	SJ 29-6		29N06W18		1		14		570		75		275		47		30		0		197		151		921
SAN JUAN 29-6 UNIT #241A		6091	SJ 29-6		29N06W19		1		17		1,484		195		716		89		78		0		549		411		922
SAN JUAN 29-6 UNIT #242A		5554	SJ 29-6		29N06W19		1		13		765		100		369		54		40		0		275		215		820
SAN JUAN 29-6 UNIT #245A		5413	SJ 29-6		29N06W08		1		14		428		56		206		43		22		0		141		106		776
SAN JUAN 29-6 UNIT #72A		6098	SJ 29-6		29N06W22		1		6		61		9		33		15		4		0		14		12		1241
SAN JUAN 29-7 UNIT #176		707	SJ 29-7		29N07W22		1		6		52		6		22		12		2		0		8		7		684
SAN JUAN 29-7 UNIT #187		832	SJ 29-7		29N07W03		1		3		18		2		8		5		1		0		2		2		696
SAN JUAN 29-7 UNIT #188		18165	SJ 29-7		29N07W06		1		8		76		9		33		15		4		0		14		11		748
SAN JUAN 29-7 UNIT #189		8020	SJ 29-7		29N07W14		1		12		221		26		96		27		10		0		59		45		694
SAN JUAN 29-7 UNIT #190		11717	SJ 29-7		29N07W16		1		8		57		7		25		14		3		0		8		6		1372
SAN JUAN 29-7 UNIT #191		945	SJ 29-7		29N07W22		1		8		74		9		32		15		3		0		13		11		749
SAN JUAN 29-7 UNIT #507S		6070	SJ 29-7		29N07W13		1		14		1,029		122		447		58		49		0		340		264		894
SAN JUAN 29-7 UNIT #520S		6062	SJ 29-7		29N07W08		1		15		600		71		261		44		28		0		188		138		888
SAN JUAN 29-7 UNIT #521S		6069	SJ 29-7		29N07W13		1		9		550		65		239		34		26		0		179		151		895
SAN JUAN 29-7 UNIT #526S		12224	SJ 29-7		29N07W21		1		8		156		18		68		19		7		0		41		34		1364
SAN JUAN 29-7 UNIT #530S		6076	SJ 29-7		29N07W34		1		19		1,100		130		478		68		52		0		358		251		1334

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 4 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 29-7 UNIT #545S		6068	SJ 29-7		29N07W12		1		17		812		96		353		54		38		0		260		192		892
SAN JUAN 29-7 UNIT #563S		1195	SJ 29-7		29N07W24		1		11		477		56		207		33		23		0		151		123		693
SAN JUAN 30-5 UNIT #201A		5722	SJ 30-5		30N05W19		1		13		443		83		307		59		33		0		214		164		969
SAN JUAN 30-5 UNIT #202A		1551	SJ 30-5		30N05W06		1		9		863		162		598		71		65		0		462		397		947
SAN JUAN 30-5 UNIT #203A		9785	SJ 30-5		30N05W06		1		10		612		115		424		60		46		0		317		264		644
SAN JUAN 30-5 UNIT #206A		5721	SJ 30-5		30N05W18		1		11		223		42		154		42		17		0		96		74		967
SAN JUAN 30-5 UNIT #207A		5034	SJ 30-5		30N05W18		1		4		61		11		42		15		5		0		23		21		756
SAN JUAN 30-5 UNIT #208A		5723	SJ 30-5		30N05W19		1		12		408		77		283		55		31		0		196		152		968
SAN JUAN 30-5 UNIT #209A		5781	SJ 30-5		30N05W30		1		3		24		4		16		10		2		0		5		4		984
SAN JUAN 30-5 UNIT #210A		5780	SJ 30-5		30N05W30		1		9		140		26		97		31		11		0		55		45		985
SAN JUAN 30-5 UNIT #212A		5782	SJ 30-5		30N05W31		1		5		39		7		27		15		3		0		10		8		987
SAN JUAN 30-5 UNIT #213A		17901	SJ 30-5		30N05W05		1		10		506		95		350		54		38		0		259		215		643
SAN JUAN 30-5 UNIT #214A		8013	SJ 30-5		30N05W05		1		12		545		102		377		61		41		0		275		219		642
SAN JUAN 30-5 UNIT #215A		5702	SJ 30-5		30N05W08		1		11		333		63		230		46		25		0		159		127		993
SAN JUAN 30-5 UNIT #216A		5731	SJ 30-5		30N05W20		1		6		114		21		79		23		9		0		47		41		971
SAN JUAN 30-5 UNIT #217A		5734	SJ 30-5		30N05W21		1		15		533		100		369		68		40		0		260		194		1239
SAN JUAN 30-5 UNIT #218A		5720	SJ 30-5		30N05W17		1		5		94		18		65		17		7		0		41		37		965
SAN JUAN 30-5 UNIT #219A		5108	SJ 30-5		30N05W16		1		9		445		84		308		50		34		0		225		187		730
SAN JUAN 30-5 UNIT #220A		8014	SJ 30-5		30N05W08		1		18		1,323		249		916		120		100		0		696		506		1203
SAN JUAN 30-5 UNIT #223A		5733	SJ 30-5		30N05W20		1		3		33		6		23		9		2		0		11		10		1238
SAN JUAN 30-5 UNIT #226A		5772	SJ 30-5		30N05W29		1		10		300		56		208		43		23		0		142		115		983
SAN JUAN 30-5 UNIT #229A		5735	SJ 30-5		30N05W21		1		15		649		122		449		76		49		0		324		242		972
SAN JUAN 30-5 UNIT #231A		5139	SJ 30-5		30N05W32		1		0		0		0		0		0		0		0		0		0		736
SAN JUAN 30-5 UNIT #234A		5737	SJ 30-5		30N05W22		1		13		373		70		258		55		28		0		175		134		975
SAN JUAN 30-5 UNIT #237A		5052	SJ 30-5		30N05W16		1		9		399		75		276		45		30		0		201		170		725
SAN JUAN 30-5 UNIT #239A		5716	SJ 30-5		30N05W15		1		10		403		76		279		49		30		0		199		162		964
SAN JUAN 30-5 UNIT #240A		5738	SJ 30-5		30N05W22		1		12		469		88		325		58		35		0		231		182		974
SAN JUAN 30-5 UNIT #241A		5739	SJ 30-5		30N05W23		1		18		1,000		188		692		103		75		0		513		359		1304
SAN JUAN 30-5 UNIT #243A		5718	SJ 30-5		30N05W15		1		11		547		103		379		58		41		0		279		228		963
SAN JUAN 30-5 UNIT #249A		5740	SJ 30-5		30N05W23		1		18		951		179		659		100		72		0		487		344		976
SAN JUAN 30-5 UNIT #255A		5714	SJ 30-5		30N05W14		1		9		211		40		146		36		16		0		94		77		962
SAN JUAN 30-5 UNIT #257A		5712	SJ 30-5		30N05W11		1		20		1,896		357		1,313		158		143		0		1,012		718		959
SAN JUAN 30-5 UNIT #258A		5715	SJ 30-5		30N05W14		1		7		493		93		341		46		37		0		258		226		961
SAN JUAN 30-5 UNIT #259A		12145	SJ 30-5		30N05W13		1		18		951		179		659		100		72		0		487		344		1353
SAN JUAN 30-5 UNIT #260A		9786	SJ 30-5		30N05W09		1		11		1,044		196		723		87		79		0		557		459		646
SAN JUAN 30-5 UNIT #261A		5713	SJ 30-5		30N05W11		1		20		1,896		357		1,313		158		143		0		1,012		718		958
SAN JUAN 30-5 UNIT #263A		12144	SJ 30-5		30N05W13		1		13		977		184		676		89		74		0		514		408		1352
SAN JUAN 30-5 UNIT #264A		5710	SJ 30-5		30N05W09		1		14		1,350		254		935		111		102		0		722		573		956
SAN JUAN 30-5 UNIT #265A		5711	SJ 30-5		30N05W10		1		12		1,307		246		905		104		99		0		703		579		957
SAN JUAN 30-5 UNIT #266A		8017	SJ 30-5		30N05W10		1		13		1,373		258		951		111		104		0		736		590		645
SAN JUAN 30-5 UNIT #267A		11794	SJ 30-5		30N05W24		1		18		1,000		188		692		103		75		0		513		359		1348

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 5 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																	OPER.						BFIT NET
								LIFE			GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS			MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 30-5 UNIT #268A		11795	SJ 30-5		30N05W24		1		18			1,000		188		692		103		75		0		513		359		1349
SAN JUAN 30-6 UNIT #400S		6042	SJ 30-6		30N07W14		1		11			349		17		64		13		7		0		44		35		845
SAN JUAN 30-6 UNIT #401S		6041	SJ 30-6		30N07W13		1		13			752		38		138		20		15		0		103		81		876
SAN JUAN 30-6 UNIT #404S		5516	SJ 30-6		30N07W23		1		4			69		3		13		4		1		0		8		7		778
SAN JUAN 30-6 UNIT #405S		5436	SJ 30-6		30N06W09		1		7			174		9		32		8		3		0		21		17		779
SAN JUAN 30-6 UNIT #408S		19395	SJ 30-6		30N06W16		1		16			599		30		110		20		12		0		78		58		685
SAN JUAN 30-6 UNIT #410S		5539	SJ 30-6		30N06W26		1		18			1,107		55		203		29		22		0		152		111		864
SAN JUAN 30-6 UNIT #411S		1258	SJ 30-6		30N07W27		1		13			420		21		77		15		8		0		54		41		648
SAN JUAN 30-6 UNIT #412S		996	SJ 30-6		30N07W24		1		15			526		26		97		18		11		0		68		51		781
SAN JUAN 30-6 UNIT #413S		5508	SJ 30-6		30N07W23		1		14			492		25		90		17		10		0		63		47		782
SAN JUAN 30-6 UNIT #414S		1260	SJ 30-6		30N07W35		1		10			207		10		38		10		4		0		23		18		651
SAN JUAN 30-6 UNIT #415S		5077	SJ 30-6		30N07W26		1		3			27		1		5		2		1		0		2		2		761
SAN JUAN 30-6 UNIT #419S		6028	SJ 30-6		30N07W11		1		6			216		11		40		8		4		0		28		24		842
SAN JUAN 30-6 UNIT #420S		6039	SJ 30-6		30N07W12		1		2			35		2		6		2		1		0		4		4		844
SAN JUAN 30-6 UNIT #422S		1261	SJ 30-6		30N07W27		1		19			657		33		121		23		13		0		84		58		690
SAN JUAN 30-6 UNIT #424S		1723	SJ 30-6		30N07W33		1		11			400		20		73		14		8		0		52		42		1272
SAN JUAN 30-6 UNIT #425S		1322	SJ 30-6		30N07W33		1		12			544		27		100		17		11		0		72		57		652
SAN JUAN 30-6 UNIT #426S		1271	SJ 30-6		30N07W34		1		4			70		3		13		4		1		0		8		7		650
SAN JUAN 30-6 UNIT #427S		1203	SJ 30-6		30N07W35		1		0	��		0		0		0		0		0		0		0		0		687
SAN JUAN 30-6 UNIT #429S		1773	SJ 30-6		30N07W32		1		13			684		34		126		20		14		0		92		72		1273
SAN JUAN 30-6 UNIT #430S		5447	SJ 30-6		30N06W08		1		7			165		8		30		7		3		0		20		17		1260
SAN JUAN 30-6 UNIT #431S		5450	SJ 30-6		30N06W10		1		12			301		15		55		13		6		0		36		28		1221
SAN JUAN 30-6 UNIT #432S		5448	SJ 30-6		30N06W10		1		11			298		15		55		12		6		0		37		29		1220
SAN JUAN 30-6 UNIT #433S		11700	SJ 30-6		30N06W11		1		15			432		22		79		17		9		0		54		40		1266
SAN JUAN 30-6 UNIT #434S		5469	SJ 30-6		30N06W12		1		13			647		32		119		19		13		0		87		69		1222
SAN JUAN 30-6 UNIT #435S		5484	SJ 30-6		30N06W13		1		2			25		1		5		2		0		0		2		2		789
SAN JUAN 30-6 UNIT #436S		5525	SJ 30-6		30N06W15		1		12			491		25		90		16		10		0		65		51		848
SAN JUAN 30-6 UNIT #437S		5504	SJ 30-6		30N06W11		1		16			718		36		132		22		14		0		96		71		790
SAN JUAN 30-6 UNIT #438S		5468	SJ 30-6		30N06W12		1		11			315		16		58		12		6		0		40		32		791
SAN JUAN 30-6 UNIT #442S		5485	SJ 30-6		30N06W14		1		13			407		20		75		15		8		0		51		39		1223
SAN JUAN 30-6 UNIT #443S		1206	SJ 30-6		30N06W36		1		11			212		11		39		11		4		0		24		19		649
SAN JUAN 30-6 UNIT #444S		19402	SJ 30-6		30N06W36		1		6			73		4		13		5		1		0		7		6		647
SAN JUAN 30-6 UNIT #445S		5479	SJ 30-6		30N06W13		1		11			325		16		60		13		6		0		40		32		794
SAN JUAN 30-6 UNIT #446S		5502	SJ 30-6		30N06W35		1		11			336		17		62		12		7		0		43		34		795
SAN JUAN 30-6 UNIT #450S		5437	SJ 30-6		30N06W07		1		7			95		5		17		6		2		0		9		8		796
SAN JUAN 30-6 UNIT #451S		5430	SJ 30-6		30N06W07		1		9			303		15		56		11		6		0		39		32		763
SAN JUAN 30-6 UNIT #452S		5438	SJ 30-6		30N06W08		1		13			387		19		71		15		8		0		48		37		797
SAN JUAN 30-6 UNIT #454S		5529	SJ 30-6		30N06W17		1		14			501		25		92		18		10		0		65		48		850
SAN JUAN 30-6 UNIT #455S		5530	SJ 30-6		30N06W18		1		9			383		19		70		12		8		0		51		42		853
SAN JUAN 30-6 UNIT #457S		5257	SJ 30-6		30N06W19		1		12			364		18		67		14		7		0		46		36		764
SAN JUAN 30-6 UNIT #460S		5487	SJ 30-6		30N06W20		1		4			71		4		13		4		1		0		8		7		798

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 6 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 30-6 UNIT #461S		5503	SJ 30-6		30N07W11		1		13		370		18		68		15		7		0		46		35		799
SAN JUAN 30-6 UNIT #462S		6040	SJ 30-6		30N07W12		1		2		11		1		2		1		0		0		1		1		843
SAN JUAN 30-6 UNIT #463S		5505	SJ 30-6		30N07W13		1		2		16		1		3		2		0		0		1		1		800
SAN JUAN 30-6 UNIT #466S		6051	SJ 30-6		30N07W22		1		14		385		19		71		16		8		0		47		35		859
SAN JUAN 30-6 UNIT #468S		5117	SJ 30-6		30N07W36		1		5		66		3		12		4		1		0		7		6		759
SAN JUAN 30-6 UNIT #471S		5488	SJ 30-6		30N06W21		1		7		231		12		42		9		5		0		29		25		803
SAN JUAN 30-6 UNIT #473S		5535	SJ 30-6		30N06W22		1		11		131		7		24		9		3		0		12		9		858
SAN JUAN 30-6 UNIT #475S		5493	SJ 30-6		30N06W27		1		12		393		20		72		15		8		0		50		39		804
SAN JUAN 30-6 UNIT #476S		5541	SJ 30-6		30N06W28		1		17		846		42		156		24		17		0		114		84		863
SAN JUAN 30-6 UNIT #477S		5130	SJ 30-6		30N06W28		1		12		860		43		158		21		17		0		119		95		760
SAN JUAN 30-6 UNIT #478S		5137	SJ 30-6		30N06W29		1		11		374		19		69		14		7		0		48		38		746
SAN JUAN 30-6 UNIT #479S		5542	SJ 30-6		30N06W29		1		9		535		27		98		14		11		0		73		62		869
SAN JUAN 30-6 UNIT #481S		5431	SJ 30-6		30N06W30		1		12		428		21		79		15		9		0		56		44		765
SAN JUAN 30-6 UNIT #483S		5500	SJ 30-6		30N06W34		1		19		1,020		51		187		28		20		0		139		100		806
SAN JUAN 30-6 UNIT #484S		5499	SJ 30-6		30N06W34		1		15		741		37		136		21		15		0		100		75		807
SAN JUAN 30-6 UNIT #485S		5116	SJ 30-6		30N07W36		1		10		270		13		50		11		5		0		33		27		996
SAN JUAN 30-6 UNIT #486S		5143	SJ 30-6		30N06W23		1		5		83		4		15		5		2		0		9		8		766
SAN JUAN 30-6 UNIT #488S		5490	SJ 30-6		30N06W24		1		8		132		7		24		8		3		0		14		11		808
SAN JUAN 30-6 UNIT #489S		5489	SJ 30-6		30N06W24		1		5		56		3		10		4		1		0		5		5		809
SAN JUAN 30-6 UNIT #490S		5492	SJ 30-6		30N06W25		1		11		235		12		43		11		5		0		27		21		810
SAN JUAN 30-6 UNIT #491S		5491	SJ 30-6		30N06W25		1		17		479		24		88		19		10		0		59		42		811
SAN JUAN 30-6 UNIT #493S		5131	SJ 30-6		30N06W32		1		4		56		3		10		4		1		0		5		5		744
SAN JUAN 30-6 UNIT #494S		5498	SJ 30-6		30N06W33		1		17		822		41		151		24		16		0		111		82		812
SAN JUAN 30-6 UNIT #495S		5497	SJ 30-6		30N06W33		1		11		626		31		115		17		13		0		85		69		813
SAN JUAN 30-6 UNIT #496S		5501	SJ 30-6		30N06W35		1		9		273		14		50		10		5		0		35		29		814
SAN JUAN 30-6 UNIT #497S		1778	SJ 30-6		30N07W29		1		13		328		16		60		14		7		0		40		31		1277
SAN JUAN 30-6 UNIT COM #467S		6049	NEBU		30N07W22		1		12		571		16		59		9		6		0		43		34		822
SAN JUAN 31 FED 3 #2A		5942	NON-UNIT		31N09W03		1		17		870		129		476		76		52		0		347		247		1169
SAN JUAN 31-6 UNIT #201A		1813	SJ 31-6		30N06W01		1		21		1,059		113		417		66		45		0		306		212		706
SAN JUAN 31-6 UNIT #202A		1812	SJ 31-6		30N06W01		1		9		250		27		98		21		11		0		66		55		1211
SAN JUAN 31-6 UNIT #203A		1819	SJ 31-6		30N06W03		1		13		296		32		116		29		13		0		75		56		718
SAN JUAN 31-6 UNIT #204A		1817	SJ 31-6		30N06W03		1		10		337		36		133		26		14		0		92		75		707
SAN JUAN 31-6 UNIT #205A		1821	SJ 31-6		30N06W04		1		1		5		1		2		1		0		0		0		0		712
SAN JUAN 31-6 UNIT #206A		1820	SJ 31-6		30N06W04		1		9		157		17		62		19		7		0		36		30		708
SAN JUAN 31-6 UNIT #209A		6030	SJ 31-6		30N07W01		1		17		877		94		346		54		38		0		254		187		933
SAN JUAN 31-6 UNIT #210A		1816	SJ 31-6		30N06W02		1		14		628		67		247		42		27		0		179		136		719
SAN JUAN 31-6 UNIT #211A		1815	SJ 31-6		30N06W02		1		15		1,320		141		520		66		57		0		397		306		710
SAN JUAN 31-6 UNIT #212A		5613	SJ 31-6		30N06W05		1		5		56		6		22		10		2		0		10		9		935
SAN JUAN 31-6 UNIT #213A		5612	SJ 31-6		30N06W05		1		10		293		31		116		25		13		0		78		63		936
SAN JUAN 31-6 UNIT #214A		1360	SJ 31-6		31N06W36		1		7		228		24		90		19		10		0		62		53		702
SAN JUAN 31-6 UNIT #215A		1361	SJ 31-6		31N06W36		1		20		1,203		129		474		70		52		0		353		247		653

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 7 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 31-6 UNIT #216A		1788	SJ 31-6		31N06W35		1		18		1,322		142		521		70		57		0		395		287		1282
SAN JUAN 31-6 UNIT #217A		1363	SJ 31-6		31N06W35		1		10		411		44		162		28		18		0		117		96		703
SAN JUAN 31-6 UNIT #218A		1790	SJ 31-6		31N06W34		1		17		1,157		124		456		64		50		0		342		247		1284
SAN JUAN 31-6 UNIT #219A		1789	SJ 31-6		31N06W34		1		18		951		102		375		58		41		0		276		195		1283
SAN JUAN 31-6 UNIT #223A		1377	SJ 31-6		31N06W32		1		5		73		8		29		10		3		0		16		14		654
SAN JUAN 31-6 UNIT #229A		1386	SJ 31-6		31N06W28		1		8		328		35		129		23		14		0		92		78		715
SAN JUAN 31-6 UNIT #230A		1383	SJ 31-6		31N06W27		1		21		1,440		154		568		78		62		0		427		301		705
SAN JUAN 31-6 UNIT #231A		1384	SJ 31-6		31N06W27		1		11		255		27		100		25		11		0		65		51		704
SAN JUAN 31-6 UNIT #234A		1385	SJ 31-6		31N06W29		1		11		344		37		136		28		15		0		93		74		688
SAN JUAN 32-7 UNIT #202A		10784	SJ 32-7		32N07W18		1		20		1,768		263		966		121		105		0		740		528		1450
SAN JUAN 32-7 UNIT #203A		5109	SJ 32-7		32N07W22		1		13		839		142		524		75		57		0		392		311		664
SAN JUAN 32-7 UNIT #204A		4126	SJ 32-7		32N07W36		1		1		8		1		5		3		1		0		1		1		1176
SAN JUAN 32-7 UNIT #205A		1231	SJ 32-7		32N07W22		1		14		2,381		404		1,486		158		162		0		1,166		940		1383
SAN JUAN 32-7 UNIT #206A		719	SJ 32-7		32N07W27		1		18		1,269		215		792		109		86		0		597		440		722
SAN JUAN 32-7 UNIT #207A		5812	SJ 32-7		32N07W27		1		9		565		96		353		51		38		0		264		224		1174
SAN JUAN 32-7 UNIT #208A		970	SJ 32-7		32N07W34		1		15		802		136		500		79		54		0		367		277		670
SAN JUAN 32-7 UNIT #209A		1207	SJ 32-7		32N07W35		1		12		821		139		512		72		56		0		384		308		672
SAN JUAN 32-7 UNIT #210A		4125	SJ 32-7		32N07W36		1		17		887		150		554		88		60		0		405		296		1177
SAN JUAN 32-7 UNIT #211A		648	SJ 32-7		32N07W35		1		10		571		97		356		55		39		0		262		215		721
SAN JUAN 32-7 UNIT #213A		12143	SJ 32-7		31N07W18		1		18		1,070		115		422		62		46		0		313		229		1351
SAN JUAN 32-7 UNIT #214A		5804	SJ 32-7		32N07W34		1		10		389		66		243		44		26		0		173		143		1178
SAN JUAN 32-7 UNIT #215A		1210	SJ 32-7		32N07W32		1		18		1,442		244		900		119		98		0		682		502		671
SAN JUAN 32-7 UNIT #216A		6120	SJ 32-7		31N07W04		1		11		415		70		259		48		28		0		183		146		1242
SAN JUAN 32-7 UNIT #217A		655	SJ 32-7		31N07W04		1		10		729		124		455		61		50		0		344		289		716
SAN JUAN 32-7 UNIT #218A		1208	SJ 32-7		31N07W07		1		22		1,914		325		1,194		152		130		0		912		641		662
SAN JUAN 32-7 UNIT #219A		6122	SJ 32-7		31N07W05		1		11		911		155		569		75		62		0		432		352		1243
SAN JUAN 32-7 UNIT #220A		6011	SJ 32-7		31N07W06		1		19		1,194		177		652		94		71		0		487		352		1170
SAN JUAN 32-7 UNIT #221A		694	SJ 32-7		31N07W08		1		10		274		46		171		39		19		0		114		92		711
SAN JUAN 32-7 UNIT #222A		6008	SJ 32-7		32N07W20		1		12		1,128		191		704		88		77		0		539		438		1180
SAN JUAN 32-7 UNIT #224A		4795	SJ 32-7		32N07W21		1		17		1,737		221		813		99		89		0		626		473		659
SAN JUAN 32-7 UNIT #227A		6010	SJ 32-7		31N07W18		1		15		573		73		268		50		29		0		189		140		1162
SAN JUAN 32-7 UNIT #228A		12142	SJ 32-7		31N07W07		1		10		351		30		112		22		12		0		77		62		1350
SAN JUAN 32-7 UNIT #229A		4893	SJ 32-7		31N07W09		1		7		243		41		152		29		17		0		106		92		714
SAN JUAN 32-7 UNIT #230A		5798	SJ 32-7		31N07W17		1		9		239		41		149		34		16		0		99		81		1171
SAN JUAN 32-7 UNIT #231A		1323	SJ 32-7		31N07W17		1		6		122		21		76		22		8		0		46		40		663
SAN JUAN 32-7 UNIT #232A		4127	SJ 32-7		31N07W08		1		13		821		139		513		75		56		0		382		300		709
SAN JUAN 32-7 UNIT #233A		11353	SJ 32-7		32N07W20		1		15		1,290		219		805		104		88		0		614		474		1365
SAN JUAN 32-7 UNIT #234A		1229	SJ 32-7		32N07W32		1		8		301		51		188		34		20		0		133		113		661
SAN JUAN 32-7 UNIT #235A		5811	SJ 32-7		32N07W29		1		11		1,318		224		823		95		90		0		638		531		1175
SAN JUAN 32-7 UNIT #237A		721	SJ 32-7		32N07W28		1		12		289		49		180		44		20		0		116		90		1380
SAN JUAN 32-7 UNIT #238A		1211	SJ 32-7		32N07W29		1		17		2,349		398		1,466		164		160		0		1,143		874		674

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 8 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 32-7 UNIT #241A		718	SJ 32-7		32N07W21		1		16		1,717		291		1,072		129		117		0		826		635		1378
SAN JUAN 32-7 UNIT #242A		1212	SJ 32-7		32N07W33		1		15		1,328		225		829		104		90		0		634		496		669
SAN JUAN 32-7 UNIT #243A		750	SJ 32-7		32N07W19		1		12		922		156		575		78		63		0		435		345		1453
SAN JUAN 32-7 UNIT #244A		5818	SJ 32-7		32N07W17		1		17		470		80		293		67		32		0		194		136		1393
SAN JUAN 32-7 UNIT #246A		12147	SJ 32-7		32N07W18		1		19		1,292		219		806		113		88		0		605		437		1354
SAN JUAN 32-8 UNIT #202A		1495	SJ 32-8		32N08W27		1		16		1,826		208		764		89		83		0		591		454		698
SAN JUAN 32-8 UNIT #203A		1213	SJ 32-8		32N08W33		1		9		399		45		167		29		18		0		120		99		686
SAN JUAN 32-8 UNIT #204A		5142	SJ 32-8		32N08W34		1		15		1,650		187		690		82		75		0		533		414		732
SAN JUAN 32-8 UNIT #205A		1504	SJ 32-8		32N08W34		1		16		1,688		192		706		84		77		0		545		419		680
SAN JUAN 32-8 UNIT #206A		5603	SJ 32-8		31N08W24		1		17		1,300		148		544		73		59		0		412		301		1158
SAN JUAN 32-8 UNIT #207A		5598	SJ 32-8		31N08W22		1		19		1,082		123		453		67		49		0		336		236		1152
SAN JUAN 32-8 UNIT #208A		4275	SJ 32-8		32N08W29		1		18		3,307		376		1,383		142		151		0		1,090		840		726
SAN JUAN 32-8 UNIT #213A		6003	SJ 32-8		32N08W22		1		16		1,950		222		815		93		89		0		633		489		1154
SAN JUAN 32-8 UNIT #218A		1514	SJ 32-8		32N08W35		1		20		2,219		252		928		108		101		0		719		525		691
SAN JUAN 32-8 UNIT #219A		1529	SJ 32-8		32N08W35		1		18		1,292		147		540		73		59		0		408		301		678
SAN JUAN 32-8 UNIT #220A		5602	SJ 32-8		31N08W24		1		14		841		96		352		51		38		0		262		204		1232
SAN JUAN 32-8 UNIT #221A		5583	SJ 32-8		31N08W09		1		7		568		65		238		31		26		0		181		159		1140
SAN JUAN 32-8 UNIT #222A		5584	SJ 32-8		31N08W09		1		18		1,430		163		598		78		65		0		455		339		1139
SAN JUAN 32-8 UNIT #223A		5588	SJ 32-8		31N08W10		1		14		1,461		166		611		73		67		0		472		375		1142
SAN JUAN 32-8 UNIT #224A		5589	SJ 32-8		31N08W10		1		11		827		94		346		46		38		0		262		215		1141
SAN JUAN 32-8 UNIT #225A		5592	SJ 32-8		31N08W15		1		14		814		92		340		50		37		0		253		197		1227
SAN JUAN 32-8 UNIT #226A		5593	SJ 32-8		31N08W15		1		12		670		76		280		42		31		0		208		168		1228
SAN JUAN 32-8 UNIT #227A		5594	SJ 32-8		31N08W16		1		14		646		73		270		46		29		0		195		148		1148
SAN JUAN 32-8 UNIT #228A		5595	SJ 32-8		31N08W16		1		15		966		110		404		58		44		0		302		229		1147
SAN JUAN 32-8 UNIT #229A		1204	SJ 32-8		32N08W20		1		14		1,299		148		543		68		59		0		417		328		660
SAN JUAN 32-8 UNIT #230A		1544	SJ 32-8		32N08W28		1		19		1,880		214		786		95		86		0		606		448		697
SAN JUAN 32-8 UNIT #231A		1541	SJ 32-8		32N08W28		1		30		4,073		463		1,703		188		186		0		1,329		863		677
SAN JUAN 32-8 UNIT #232A		972	SJ 32-8		32N08W29		1		15		1,370		156		573		72		62		0		439		338		665
SAN JUAN 32-8 UNIT #233A		5675	SJ 32-8		32N08W30		1		17		1,349		153		564		73		61		0		429		323		1237
SAN JUAN 32-8 UNIT #234A		4904	SJ 32-8		31N08W21		1		12		515		59		215		37		23		0		155		123		1150
SAN JUAN 32-8 UNIT #235A		5597	SJ 32-8		31N08W21		1		11		468		53		196		33		21		0		141		114		1149
SAN JUAN 32-8 UNIT #236A		5599	SJ 32-8		31N08W22		1		14		550		63		230		42		25		0		163		123		1229
SAN JUAN 32-8 UNIT #237A		5601	SJ 32-8		31N08W23		1		9		297		34		124		25		14		0		86		71		1231
SAN JUAN 32-8 UNIT #238A		5600	SJ 32-8		31N08W23		1		7		237		27		99		19		11		0		69		60		1230
SAN JUAN 32-8 UNIT #239A		5670	SJ 32-8		32N08W30		1		9		467		53		195		31		21		0		144		120		1161
SAN JUAN 32-8 UNIT #240A		5047	SJ 32-8		31N08W03		1		16		1,279		145		535		69		58		0		407		312		997
SAN JUAN 32-8 UNIT #241A		5558	SJ 32-8		31N08W04		1		12		1,174		133		491		60		53		0		377		306		1224
SAN JUAN 32-8 UNIT #242A		5557	SJ 32-8		31N08W04		1		12		917		104		383		51		42		0		291		236		1138
SAN JUAN 32-8 UNIT #243A		1884	SJ 32-8		31N08W11		1		14		1,025		117		429		58		47		0		324		251		679
SAN JUAN 32-8 UNIT #244A		5591	SJ 32-8		31N08W14		1		10		480		55		201		33		22		0		146		119		1226
SAN JUAN 32-8 UNIT #245A		5590	SJ 32-8		31N08W14		1		10		542		62		227		34		25		0		168		139		1225

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 9 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 32-8 UNIT #247A		5999	SJ 32-8		32N08W19		1		16		1,953		222		817		92		89		0		636		496		1199
SAN JUAN 32-8 UNIT #248A		1885	SJ 32-8		31N08W11		1		10		354		40		148		28		16		0		104		84		676
SAN JUAN 32-8 UNIT #249R		11696	SJ 32-8		31N08W03		1		7		326		37		136		22		15		0		99		86		1265
SAN JUAN 32-8 UNIT #250A		5048	SJ 32-8		32N08W33		1		15		1,888		215		789		90		86		0		614		480		723
SAN JUAN 32-8 UNIT #253A		1887	SJ 32-8		32N08W27		1		16		1,259		143		527		69		57		0		401		306		699
SAN JUAN 32-8 UNIT #254A		12149	SJ 32-8		32N08W23		1		18		1,692		192		708		87		77		0		544		407		1355
SAN JUAN 32-8 UNIT #255A		1867	SJ 32-8		32N08W24		1		15		1,160		132		485		65		53		0		367		281		701
SAN JUAN 32-8 UNIT #256A		1888	SJ 32-8		32N08W25		1		20		2,087		237		873		104		95		0		674		490		700
SAN JUAN 32-8 UNIT #257A		6000	SJ 32-8		32N08W19		1		7		937		106		392		44		43		0		305		271		1200
SAN JUAN 32-8 UNIT #258A		6001	SJ 32-8		32N08W15		1		19		1,609		183		673		86		73		0		514		369		1438
SAN JUAN 32-8 UNIT #259		6004	SJ 32-8		32N08W22		1		22		2,374		270		993		117		108		0		768		539		1153
SAN JUAN 32-8 UNIT #260A		5998	SJ 32-8		32N08W18		1		11		1,389		158		581		65		63		0		453		380		1370
SAN JUAN 32-8 UNIT #261A		6507	SJ 32-8		32N08W17		1		13		352		40		147		34		16		0		97		73		1202
SAN JUAN 32-8 UNIT #262A		727	SJ 32-8		32N08W17		1		7		381		43		159		24		17		0		117		102		1362
SAN JUAN 32-8 UNIT #264A		11695	SJ 32-8		32N08W09		1		0		2		0		1		1		0		0		0		0		1374
SAN JUAN 32-8 UNIT #267		6005	SJ 32-8		32N08W23		1		22		2,457		279		1,028		120		112		0		796		558		1323
SAN JUAN 32-9 UNIT #104S		5911	SJ 32-9		32N10W24		1		18		1,445		38		139		18		15		0		106		76		1107
SAN JUAN 32-9 UNIT #201S		5935	SJ 32-9		31N09W02		1		7		232		6		22		4		2		0		15		13		1076
SAN JUAN 32-9 UNIT #202S		5939	SJ 32-9		31N09W02		1		12		536		14		51		9		6		0		37		30		1075
SAN JUAN 32-9 UNIT #215S		5992	SJ 32-9		32N09W10		1		17		856		22		82		13		9		0		60		43		1089
SAN JUAN 32-9 UNIT #217S		5994	SJ 32-9		32N09W16		1		9		382		10		37		6		4		0		26		22		1322
SAN JUAN 32-9 UNIT #226S		5970	SJ 32-9		32N09W32		1		7		239		6		23		5		3		0		16		14		1119
SAN JUAN 32-9 UNIT #228S		5978	SJ 32-9		32N09W36		1		4		124		3		12		2		1		0		8		8		1127
SAN JUAN 32-9 UNIT #229S		5933	SJ 32-9		32N10W36		1		10		461		12		44		7		5		0		32		27		1125
SAN JUAN 32-9 UNIT #230S		5934	SJ 32-9		32N10W36		1		6		331		9		32		5		3		0		23		21		1320
SAN JUAN 32-9 UNIT #235S		5979	SJ 32-9		32N09W36		1		7		406		11		39		6		4		0		29		25		1126
SAN JUAN 32-9 UNIT #241S		5993	SJ 32-9		32N09W13		1		22		2,415		63		232		27		25		0		180		126		1441
SAN JUAN 32-9 UNIT #250S		5945	SJ 32-9		31N09W04		1		16		912		24		88		13		10		0		65		48		1240
SAN JUAN 32-9 UNIT #251S		5947	SJ 32-9		31N09W04		1		15		676		18		65		11		7		0		47		35		1321
SAN JUAN 32-9 UNIT #252S		5949	SJ 32-9		31N09W05		1		10		597		16		57		8		6		0		43		36		1080
SAN JUAN 32-9 UNIT #253S		5952	SJ 32-9		31N09W05		1		5		139		4		13		3		1		0		9		8		1079
SAN JUAN 32-9 UNIT #254S		5953	SJ 32-9		31N09W06		1		12		531		14		51		8		6		0		37		29		1082
SAN JUAN 32-9 UNIT #255S		5955	SJ 32-9		31N09W06		1		7		95		2		9		3		1		0		5		4		1081
SAN JUAN 32-9 UNIT #257S		5957	SJ 32-9		31N09W08		1		8		91		2		9		4		1		0		4		3		1083
SAN JUAN 32-9 UNIT #259S		5959	SJ 32-9		31N09W09		1		7		261		7		25		5		3		0		18		15		1085
SAN JUAN 32-9 UNIT #260S		5960	SJ 32-9		31N09W10		1		6		308		8		30		5		3		0		22		19		1088
SAN JUAN 32-9 UNIT #261S		5961	SJ 32-9		31N09W10		1		16		654		17		63		11		7		0		45		34		1087
SAN JUAN 32-9 UNIT #262S		12591	SJ 32-9		31N09W15		1		13		471		12		45		8		5		0		32		24		1443
SAN JUAN 32-9 UNIT #268S		5859	SJ 32-9		31N10W01		1		16		787		21		76		12		8		0		55		41		1314
SAN JUAN 32-9 UNIT #270S		5991	SJ 32-9		32N09W18		1		6		643		17		62		7		7		0		48		43		1103
SAN JUAN 32-9 UNIT #271S		1351	SJ 32-9		32N09W18		1		16		1,377		36		132		17		14		0		101		77		733

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 10 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 32-9 UNIT #272S		12611	SJ 32-9		32N09W21		1		17		1,227		32		118		16		13		0		89		65		1447
SAN JUAN 32-9 UNIT #273S		5980	SJ 32-9		32N09W19		1		10		956		25		92		11		10		0		71		59		1104
SAN JUAN 32-9 UNIT #274S		5962	SJ 32-9		32N09W28		1		10		473		12		45		7		5		0		33		27		1113
SAN JUAN 32-9 UNIT #275S		5965	SJ 32-9		32N09W29		1		7		427		11		41		6		4		0		30		26		1114
SAN JUAN 32-9 UNIT #276S		5964	SJ 32-9		32N09W27		1		11		656		17		63		9		7		0		47		39		1112
SAN JUAN 32-9 UNIT #277S		5966	SJ 32-9		32N09W30		1		16		683		18		66		11		7		0		47		35		1115
SAN JUAN 32-9 UNIT #278S		5967	SJ 32-9		32N09W31		1		9		345		9		33		6		4		0		23		19		1117
SAN JUAN 32-9 UNIT #279S		5968	SJ 32-9		32N09W31		1		6		235		6		23		4		2		0		16		14		1116
SAN JUAN 32-9 UNIT #281S		5974	SJ 32-9		32N09W32		1		8		299		8		29		5		3		0		20		17		1118
SAN JUAN 32-9 UNIT #282S		5975	SJ 32-9		32N09W33		1		4		71		2		7		2		1		0		4		4		1121
SAN JUAN 32-9 UNIT #283S		5976	SJ 32-9		32N09W33		1		8		370		10		36		6		4		0		26		22		1120
SAN JUAN 32-9 UNIT #284S		1357	SJ 32-9		32N10W13		1		13		1,089		28		105		13		11		0		80		64		998
SAN JUAN 32-9 UNIT #285S		5855	SJ 32-9		32N10W13		1		18		1,472		38		141		18		15		0		108		78		1096
SAN JUAN 32-9 UNIT #286S		5914	SJ 32-9		32N10W14		1		8		794		21		76		9		8		0		59		51		1098
SAN JUAN 32-9 UNIT #287S		5915	SJ 32-9		32N10W14		1		7		561		15		54		7		6		0		41		37		1097
SAN JUAN 32-9 UNIT #288S		5916	SJ 32-9		32N10W23		1		18		1,445		38		139		18		15		0		106		76		1106
SAN JUAN 32-9 UNIT #289S		5918	SJ 32-9		32N10W23		1		3		132		3		13		2		1		0		9		8		1105
SAN JUAN 32-9 UNIT #291S		5402	SJ 32-9		32N10W24		1		17		1,287		34		124		16		13		0		94		71		728
SAN JUAN 32-9 UNIT #292S		5925	SJ 32-9		32N10W25		1		11		653		17		63		9		7		0		47		38		1109
SAN JUAN 32-9 UNIT #293S		5927	SJ 32-9		32N10W25		1		13		746		19		72		11		8		0		53		41		1108
SAN JUAN 32-9 UNIT #294S		5930	SJ 32-9		32N10W26		1		6		219		6		21		4		2		0		15		13		1111
SAN JUAN 32-9 UNIT #295S		5931	SJ 32-9		32N10W26		1		12		454		12		44		8		5		0		31		25		1110
SAN JUAN 32-9 UNIT #300S		5856	SJ 32-9		32N10W11		1		6		399		10		38		5		4		0		29		26		1092
SAN JUAN 32-9 UNIT #301S		5857	SJ 32-9		32N10W12		1		10		558		15		54		8		6		0		40		33		1095
SAN JUAN 32-9 UNIT #302S		12613	SJ 32-9		32N09W09		1		13		1,599		42		154		17		17		0		119		96		1368
SEYMOUR #720S		12603	NON-UNIT		31N09W23		1		15		504		37		136		28		15		0		93		69		1134
STATE COM FC #20A		6006	NON-UNIT		30N08W02		1		11		412		7		27		5		3		0		19		15		1069
NE BLANCO UNIT #416A		5282	NEBU		31N07W21		1		19		1,100		9		31		4		3		0		24		17		1063
NE BLANCO UNIT #466A		6027	NEBU		31N07W34		1		18		1,400		11		40		5		4		0		31		22		1059
SAN JUAN 32-7 UNIT #240A		717	SJ 32-7		32N07W19		1		20		2,000		339		1,248		153		136		0		959		680		1452
SAN JUAN 32-9 UNIT #297S		5854	SJ 32-9		32N10W35		1		18		1,000		26		96		14		10		0		71		49		1122
TOTAL PROVED DEVELOPED: 160-Acre New Mexico							406				286,052		25,236		92,868		13,439		10,115		0		69,314		53,022
ALLISON UNIT COM #105		13888	SJ 32-7		32N07W26		1		17		1,588		67		248		31		27		0		190		143		1406
ALLISON UNIT COM #146		4750	SJ 32-7		32N07W26		1		15		1,357		115		423		54		46		0		323		250		1384
BARNES GAS COM F #1		14369	NON-UNIT		32N11W23		1		8		63		4		13		7		1		0		4		3		474
BLANCO #201		13592	NON-UNIT		31N08W35		1		19		1,412		208		767		105		84		0		579		416		413
BLANCO #202		13651	NON-UNIT		31N08W26		1		30		2,417		357		1,313		172		143		0		998		626		509
BLANCO #203		13649	NON-UNIT		31N08W35		1		16		739		109		401		67		44		0		291		216		498
BLANCO #204R		14451	NON-UNIT		31N08W26		1		19		1,006		149		547		86		60		0		401		284		591
BLANCO #330		14219	NON-UNIT		31N08W05		1		18		1,643		120		442		56		48		0		337		249		547
BONDS COM #100		14220	NON-UNIT		32N10W15		1		30		4,493		223		822		86		90		0		647		426		455

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 11 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
CAT DRAW COM #101		20070	SJ 30-5		30N05W29		1		18		1,698		80		295		35		32		0		227		170		1466
DECKER GAS COM A #1		14370	NON-UNIT		32N10W17		1		18		1,604		117		431		54		47		0		330		246		477
EAGLE #750 (APO)		14375	NON-UNIT		32N09W16		1		14		909		18		66		9		7		0		50		39		495
FC BARNES #1		14371	NON-UNIT		32N11W15		1		23		493		9		32		11		3		0		17		10		418
FC FEE COM #2		14277	NON-UNIT		32N11W30		1		4		31		1		2		2		0		0		0		0		497
FC STATE COM #19		14276	NON-UNIT		30N09W36		1		18		165		3		12		6		1		0		5		3		541
FC STATE COM #20		12651	NON-UNIT		30N08W02		1		18		1,277		23		84		12		9		0		63		47		466
FEDERAL G #4 COM		4755	NON-UNIT		31N07W10		1		12		439		18		67		13		7		0		47		37		467
GRASSY CANYON UNIT #3		4762	SJ 32-7		32N07W31		1		24		2,080		134		494		63		54		0		377		256		580
HEIZER #100		14203	NON-UNIT		32N10W15		1		17		2,153		1		4		0		0		0		3		2		378
HUBBARD GAS COM A #1		14250	NON-UNIT		32N11W30		1		8		78		3		10		6		1		0		3		2		496
HUERFANO UNIT #118 COM		4765	HUERFANO		27N10W30		1		12		181		13		47		15		5		0		27		20		366
HUERFANO UNIT #12		14215	HUERFANO		26N10W04		1		1		3		0		2		1		0		0		0		0		352
HUERFANO UNIT #138		17003	HUERFANO		26N09W22		1		4		29		4		15		9		2		0		4		4		350
HUERFANO UNIT #14R		14218	HUERFANO		26N10W05		1		18		308		43		160		49		17		0		94		63		362
HUERFANO UNIT #18 COM		16974	HUERFANO		27N10W32		1		0		0		0		0		0		0		0		0		0		355
HUERFANO UNIT #182		17019	HUERFANO		26N09W28		1		0		0		0		0		0		0		0		0		0		360
HUERFANO UNIT #19		14221	HUERFANO		26N10W05		1		4		33		5		17		9		2		0		7		6		354
HUERFANO UNIT #22		14216	HUERFANO		27N10W33		1		25		387		55		201		64		22		0		115		68		356
HUERFANO UNIT #223		14004	HUERFANO		26N10W04		1		17		274		39		143		44		16		0		83		57		363
HUERFANO UNIT #231		17004	HUERFANO		26N09W06		1		22		468		66		243		62		27		0		155		99		364
HUERFANO UNIT #237		17005	HUERFANO		26N09W17		1		20		295		42		153		51		17		0		86		55		365
HUERFANO UNIT #24		14222	HUERFANO		27N10W29		1		7		78		11		41		17		4		0		19		16		357
HUERFANO UNIT #255		17006	HUERFANO		27N09W31		1		36		1,081		153		562		116		61		0		385		203		369
HUERFANO UNIT #257		17007	HUERFANO		27N10W36		1		35		850		120		442		103		48		0		292		154		367
HUERFANO UNIT #258S		2326	HUERFANO		27N10W36		1		14		296		42		154		40		17		0		97		71		1191
HUERFANO UNIT #259		13989	HUERFANO		26N10W06		1		6		50		7		26		13		3		0		10		9		368
HUERFANO UNIT #282		14512	HUERFANO		27N10W31		1		17		348		49		181		48		20		0		113		78		372
HUERFANO UNIT #286		14202	HUERFANO		27N10W35		1		32		575		81		299		86		33		0		180		96		374
HUERFANO UNIT #46		13951	HUERFANO		26N09W23		1		21		460		65		239		61		26		0		153		98		349
HUERFANO UNIT #500		17008	HUERFANO		26N09W20		1		1		3		0		2		1		0		0		0		0		603
HUERFANO UNIT #501		17009	HUERFANO		26N09W20		1		18		449		63		234		54		25		0		154		105		599
HUERFANO UNIT #502		17010	HUERFANO		26N09W21		1		0		0		0		0		0		0		0		0		0		602
HUERFANO UNIT #503		13987	HUERFANO		26N09W21		1		4		39		5		20		10		2		0		8		7		601
HUERFANO UNIT #504		17011	HUERFANO		26N09W22		1		3		27		4		14		7		2		0		5		5		608
HUERFANO UNIT #505		17012	HUERFANO		26N09W30		1		36		839		119		437		104		48		0		285		148		600
HUERFANO UNIT #507		17013	HUERFANO		26N09W27		1		21		397		56		207		56		23		0		128		83		604
HUERFANO UNIT #508		13985	HUERFANO		26N09W26		1		36		887		125		462		107		50		0		304		157		605
HUERFANO UNIT #509		13999	HUERFANO		27N10W30		1		7		69		10		36		16		4		0		16		14		607
HUERFANO UNIT #518		17014	HUERFANO		26N09W16		1		28		491		69		255		75		28		0		152		85		609
HUERFANO UNIT #520		17015	HUERFANO		26N09W17		1		25		406		57		211		65		23		0		124		74		610

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 12 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																	OPER.						BFIT NET
								LIFE		GROSS GAS			NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF			MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
HUERFANO UNIT #521		17016	HUERFANO		27N10W35		1		40		1,171			166		609		126		66		0		417		210		612
HUERFANO UNIT #522		17017	HUERFANO		27N09W31		1		38		1,191	��		168		619		123		67		0		429		224		611
HUERFANO UNIT #523		14008	HUERFANO		26N09W23		1		25		509			72		265		70		29		0		166		100		613
HUERFANO UNIT #528		12464	HUERFANO		26N10W06		1		16		190			27		99		38		11		0		50		35		620
HUERFANO UNIT #549		13950	HUERFANO		27N10W33		1		18		361			51		188		50		20		0		117		79		598
HUERFANO UNIT #55		14223	HUERFANO		26N09W27		1		10		115			16		60		25		7		0		28		22		347
HUERFANO UNIT #550		17018	HUERFANO		27N10W29		1		19		263			37		137		48		15		0		74		48		606
HUERFANO UNIT #551 COM		4766	HUERFANO		26N09W16		1		15		232			12		45		15		5		0		26		18		626
HUERFANO UNIT #59		13952	HUERFANO		26N09W26		1		7		49			7		25		15		3		0		8		6		348
HUERFANO UNIT #6		14377	HUERFANO		27N10W31		1		15		252			36		131		40		14		0		77		55		359
HUERFANO UNIT #600		706	HUERFANO		27N10W32		1		10		120			17		62		24		7		0		31		24		673
HUERFANO UNIT #70		14224	HUERFANO		26N10W08		1		10		100			14		52		24		6		0		23		18		351
HUERFANO UNIT #74		13988	HUERFANO		27N10W19		1		2		9			1		5		3		0		0		1		1		358
JAQUEZ #331		14343	NON-UNIT		31N08W06		1		23		2,084			159		585		69		64		0		453		315		530
KEYS GAS COM G #1R		14212	NON-UNIT		32N10W27		1		12		420			1		2		0		0		0		2		1		375
MIDDLE MESA COM #3		4768	SJ 32-7		32N07W33		1		16		1,476			64		237		30		26		0		182		140		1385
MOORE, WAYNE COM #2		14442	NON-UNIT		31N09W16		1		22		928			34		127		22		14		0		91		61		578
NE BLANCO UNIT #400R		14350	NEBU		31N06W07		1		21		1,824			14		52		6		6		0		41		29		550
NE BLANCO UNIT #401		14278	NEBU		30N07W09		1		17		1,141			9		33		4		4		0		25		19		34
NE BLANCO UNIT #402		13561	NEBU		30N07W05		1		24		1,967			15		56		7		6		0		44		30		376
NE BLANCO UNIT #403R		14279	NEBU		30N07W09		1		22		1,531			12		44		5		5		0		34		23		189
NE BLANCO UNIT #404R		14280	NEBU		31N07W34		1		15		1,116			9		32		4		3		0		25		19		561
NE BLANCO UNIT #406		13560	NEBU		31N07W22		1		25		1,833			14		52		6		6		0		41		27		377
NE BLANCO UNIT #407		14281	NEBU		30N07W21		1		27		1,700			13		49		6		5		0		37		24		36
NE BLANCO UNIT #408		13562	NEBU		31N07W20		1		17		827			6		24		3		3		0		18		13		406
NE BLANCO UNIT #409		14282	NEBU		30N07W10		1		18		1,105			9		32		4		3		0		24		18		35
NE BLANCO UNIT #410		14283	NEBU		31N07W09		1		16		1,097			9		31		4		3		0		24		18		421
NE BLANCO UNIT #411		14284	NEBU		30N07W10		1		26		1,490			12		43		6		5		0		32		21		78
NE BLANCO UNIT #412		14285	NEBU		31N07W29		1		15		1,047			8		30		4		3		0		23		18		408
NE BLANCO UNIT #413R		14286	NEBU		30N07W20		1		20		1,045			8		30		4		3		0		23		16		257
NE BLANCO UNIT #414		13569	NEBU		31N07W30		1		18		1,122			9		32		4		3		0		25		18		403
NE BLANCO UNIT #415		14287	NEBU		30N07W02		1		25		1,347			10		39		5		4		0		29		19		71
NE BLANCO UNIT #416		13563	NEBU		31N07W21		1		19		627			5		18		3		2		0		13		9		395
NE BLANCO UNIT #417		14288	NEBU		30N07W02		1		31		2,767			22		79		9		9		0		62		39		72
NE BLANCO UNIT #418		14289	NEBU		31N07W28		1		13		721			6		21		3		2		0		16		12		410
NE BLANCO UNIT #419		14290	NEBU		30N07W03		1		20		1,379			11		39		5		4		0		30		22		77
NE BLANCO UNIT #420		13564	NEBU		31N07W28		1		0		0			0		0		0		0		0		0		0		394
NE BLANCO UNIT #421R		14291	NEBU		30N07W04		1		17		1,210			9		35		4		4		0		27		20		151
NE BLANCO UNIT #422		13570	NEBU		31N07W20		1		20		1,061			8		30		4		3		0		23		16		397
NE BLANCO UNIT #423R		14292	NEBU		30N07W08		1		16		1,080			8		31		4		3		0		24		18		286
NE BLANCO UNIT #424		14293	NEBU		30N07W04		1		22		1,935			15		55		6		6		0		43		30		385

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 13 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
NE BLANCO UNIT #425R		14294	NEBU		30N07W08		1		29		2,718		21		78		8		8		0		61		40		169
NE BLANCO UNIT #426		14262	NEBU		31N06W06		1		24		1,750		14		50		6		5		0		39		26		440
NE BLANCO UNIT #427R		14295	NEBU		30N07W16		1		15		685		5		20		3		2		0		15		11		194
NE BLANCO UNIT #428		13571	NEBU		31N07W24		1		16		1,066		8		31		4		3		0		23		18		420
NE BLANCO UNIT #429R		14296	NEBU		30N07W17		1		10		369		3		11		2		1		0		8		6		226
NE BLANCO UNIT #430		13565	NEBU		30N07W05		1		15		582		5		17		3		2		0		12		9		398
NE BLANCO UNIT #431		14297	NEBU		30N07W17		1		30		2,334		18		67		8		7		0		52		32		74
NE BLANCO UNIT #432		13566	NEBU		30N07W07		1		23		1,829		14		52		6		6		0		41		28		399
NE BLANCO UNIT #433		14298	NEBU		30N07W19		1		12		206		2		6		2		1		0		4		3		76
NE BLANCO UNIT #434		14299	NEBU		31N07W23		1		22		2,236		17		64		7		7		0		50		36		423
NE BLANCO UNIT #435		14300	NEBU		30N08W01		1		21		906		7		26		4		3		0		19		13		383
NE BLANCO UNIT #436		13572	NEBU		31N06W19		1		18		910		7		26		4		3		0		20		14		425
NE BLANCO UNIT #437		14301	NEBU		30N08W12		1		22		815		6		23		4		3		0		17		11		382
NE BLANCO UNIT #438		14361	NEBU		31N06W18		1		23		1,006		8		29		4		3		0		21		14		452
NE BLANCO UNIT #439		14302	NEBU		30N08W13		1		29		2,596		20		74		8		8		0		58		38		380
NE BLANCO UNIT #440		13573	NEBU		31N07W11		1		19		1,147		9		33		4		4		0		25		18		431
NE BLANCO UNIT #441R		14303	NEBU		30N08W24		1		30		1,457		11		42		6		5		0		31		19		475
NE BLANCO UNIT #442		14304	NEBU		31N07W11		1		19		1,136		9		33		4		4		0		25		18		436
NE BLANCO UNIT #443		14305	NEBU		30N08W24		1		29		1,333		10		38		6		4		0		28		17		381
NE BLANCO UNIT #444		14362	NEBU		31N07W23		1		12		493		4		14		2		2		0		10		8		461
NE BLANCO UNIT #445		14306	NEBU		31N08W25		1		25		1,414		11		40		5		4		0		31		20		388
NE BLANCO UNIT #446		14307	NEBU		31N07W33		1		18		527		4		15		3		2		0		11		7		400
NE BLANCO UNIT #447		14308	NEBU		31N08W36		1		17		602		5		17		3		2		0		12		9		379
NE BLANCO UNIT #448		13567	NEBU		31N07W32		1		16		752		6		22		3		2		0		16		12		384
NE BLANCO UNIT #449		14309	NEBU		31N07W19		1		20		773		6		22		4		2		0		16		11		391
NE BLANCO UNIT #450		14310	NEBU		31N07W32		1		15		588		5		17		3		2		0		12		9		389
NE BLANCO UNIT #451		14311	NEBU		30N07W06		1		25		1,478		12		42		6		5		0		32		21		405
NE BLANCO UNIT #452		13574	NEBU		31N07W15		1		4		88		1		3		1		0		0		2		1		422
NE BLANCO UNIT #453		14312	NEBU		30N07W06		1		23		1,314		10		38		5		4		0		29		19		390
NE BLANCO UNIT #454		14313	NEBU		31N07W33		1		20		1,420		11		41		5		4		0		31		23		409
NE BLANCO UNIT #455		14314	NEBU		31N07W31		1		25		2,612		20		75		8		8		0		59		40		387
NE BLANCO UNIT #456		13575	NEBU		31N07W26		1		10		346		3		10		2		1		0		7		6		417
NE BLANCO UNIT #457		14315	NEBU		31N07W31		1		19		1,077		8		31		4		3		0		23		17		392
NE BLANCO UNIT #458		13576	NEBU		31N07W13		1		11		437		3		13		2		1		0		9		7		416
NE BLANCO UNIT #459		14316	NEBU		31N07W19		1		31		3,238		25		93		10		10		0		73		46		415
NE BLANCO UNIT #460		14351	NEBU		31N06W07		1		21		1,818		14		52		6		6		0		40		29		424
NE BLANCO UNIT #461		14317	NEBU		30N07W07		1		20		860		7		25		4		3		0		18		13		543
NE BLANCO UNIT #462		14318	NEBU		31N07W01		1		21		1,948		15		56		6		6		0		44		31		428
NE BLANCO UNIT #463		14319	NEBU		30N07W18		1		21		816		6		23		4		3		0		17		11		411
NE BLANCO UNIT #464		13577	NEBU		31N07W10		1		13		518		4		15		2		2		0		11		8		429
NE BLANCO UNIT #465		14320	NEBU		30N08W01		1		16		1,021		8		29		4		3		0		22		17		404

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 14 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
NE BLANCO UNIT #466		14321	NEBU		31N07W34		1		15		893		7		26		3		3		0		19		15		462
NE BLANCO UNIT #467		14322	NEBU		30N08W12		1		16		548		4		16		3		2		0		11		8		407
NE BLANCO UNIT #468		14323	NEBU		31N07W35		1		20		1,212		9		35		4		4		0		26		19		457
NE BLANCO UNIT #469		14324	NEBU		30N08W13		1		25		2,626		20		75		8		8		0		59		40		393
NE BLANCO UNIT #470		14352	NEBU		31N07W27		1		19		741		6		21		3		2		0		15		11		438
NE BLANCO UNIT #471		14325	NEBU		31N08W25		1		20		1,548		12		44		5		5		0		34		25		402
NE BLANCO UNIT #472		14326	NEBU		31N07W29		1		13		505		4		14		2		2		0		11		8		401
NE BLANCO UNIT #473		14327	NEBU		31N08W36		1		22		2,393		19		69		7		7		0		54		39		396
NE BLANCO UNIT #474		14353	NEBU		31N07W26		1		12		403		3		12		2		1		0		8		7		437
NE BLANCO UNIT #475		14328	NEBU		30N07W19		1		16		547		4		16		3		2		0		11		8		298
NE BLANCO UNIT #476		14329	NEBU		31N07W22		1		21		1,513		12		43		5		5		0		33		23		435
NE BLANCO UNIT #477		14379	NEBU		30N07W29		1		14		379		3		11		2		1		0		8		6		93
NE BLANCO UNIT #478		14330	NEBU		31N07W21		1		19		1,215		9		35		4		4		0		27		19		386
NE BLANCO UNIT #479R		13942	NEBU		30N07W20		1		22		1,365		11		39		5		4		0		30		21		334
NE BLANCO UNIT #480		14332	NEBU		31N07W14		1		19		1,176		9		34		4		4		0		26		18		463
NE BLANCO UNIT #481		14333	NEBU		31N07W36		1		16		836		7		24		3		3		0		18		14		86
NE BLANCO UNIT #482		14334	NEBU		31N07W15		1		20		1,819		14		52		6		6		0		41		29		439
NE BLANCO UNIT #483		14335	NEBU		31N07W36		1		12		418		3		12		2		1		0		9		7		85
NE BLANCO UNIT #484		14336	NEBU		31N07W16		1		12		426		3		12		2		1		0		9		7		430
NE BLANCO UNIT #485		14337	NEBU		30N07W03		1		14		792		6		23		3		2		0		17		13		131
NE BLANCO UNIT #486		14338	NEBU		31N06W19		1		17		1,481		12		42		5		5		0		33		25		472
NE BLANCO UNIT #487		14339	NEBU		31N07W35		1		30		2,868		22		82		9		9		0		64		41		464
NE BLANCO UNIT #488		14340	NEBU		31N07W24		1		20		2,067		16		59		6		6		0		46		34		458
NE BLANCO UNIT #489		14364	NEBU		31N07W12		1		9		181		1		5		1		1		0		3		3		456
NE BLANCO UNIT #490		14363	NEBU		31N07W14		1		14		783		6		22		3		2		0		17		13		434
NE BLANCO UNIT #491		14368	NEBU		31N07W25		1		15		537		4		15		3		2		0		11		8		152
NE BLANCO UNIT #492		14354	NEBU		31N07W12		1		16		935		7		27		4		3		0		20		15		453
NE BLANCO UNIT #493		14380	NEBU		31N07W25		1		16		700		5		20		3		2		0		15		11		143
NE BLANCO UNIT #494		14341	NEBU		31N07W27		1		24		1,107		9		32		5		3		0		24		16		465
NE BLANCO UNIT #495		14381	NEBU		31N06W30		1		18		895		7		26		4		3		0		19		14		144
NE BLANCO UNIT #496		14355	NEBU		31N06W18		1		15		928		7		27		3		3		0		20		16		459
NE BLANCO UNIT #497		14382	NEBU		31N06W30		1		21		1,064		8		30		4		3		0		23		16		146
NE BLANCO UNIT #498		14365	NEBU		31N07W13		1		16		982		8		28		4		3		0		21		16		460
NE BLANCO UNIT #499		14383	NEBU		31N06W20		1		24		1,689		13		48		6		5		0		37		25		179
NE BLANCO UNIT #500		14356	NEBU		31N06W20		1		29		1,870		15		54		7		6		0		41		26		454
NE BLANCO UNIT #504		14342	NEBU		31N07W16		1		15		808		6		23		3		3		0		17		13		513
NE BLANCO UNIT #505		14384	NEBU		30N07W21		1		31		1,717		13		49		7		5		0		37		23		319
NORDHAUS #716		14360	NON-UNIT		31N09W13		1		25		1,985		144		531		71		58		0		403		268		549
PAYNE #201		14225	NON-UNIT		32N10W20		1		13		621		11		42		7		5		0		30		23		546
QUINN #336		14226	NON-UNIT		31N08W17		1		14		808		59		218		33		24		0		161		125		451
RATTLESNAKE CANYON #105		4770	SJ 32-8		32N08W20		1		16		1,802		77		283		33		31		0		219		170		1387

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 15 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 28-5 UNIT #219		13793	SJ 28-5		28N05W30		1		14		117		48		177		96		19		0		62		43		245
SAN JUAN 28-5 UNIT #223		13740	SJ 28-5		28N05W34		1		0		0		0		0		0		0		0		0		0		246
SAN JUAN 28-6 UNIT #230		19631	SJ 28-6		27N06W06		1		4		28		2		6		4		1		0		1		1		1376
SAN JUAN 28-6 UNIT #232		19627	SJ 28-6		27N06W07		1		7		49		3		10		6		1		0		3		2		1375
SAN JUAN 28-6 UNIT #400		13883	SJ 28-6		28N06W09		1		21		238		13		49		21		5		0		23		14		98
SAN JUAN 28-6 UNIT #404		14227	SJ 28-6		28N06W13		1		6		38		16		59		42		6		0		10		8		124
SAN JUAN 28-6 UNIT #405		13884	SJ 28-6		28N06W18		1		13		154		9		32		13		3		0		16		12		153
SAN JUAN 28-6 UNIT #406		13885	SJ 28-6		28N06W19		1		24		307		17		64		24		7		0		33		19		112
SAN JUAN 28-6 UNIT #410		14228	SJ 28-6		28N06W13		1		0		0		0		0		0		0		0		0		0		214
SAN JUAN 28-6 UNIT #414		13886	SJ 28-6		28N06W08		1		19		222		13		46		19		5		0		22		14		260
SAN JUAN 28-6 UNIT #418		13757	SJ 28-6		28N06W28		1		5		37		2		8		5		1		0		2		2		297
SAN JUAN 28-6 UNIT #421		13758	SJ 28-6		28N06W33		1		8		98		6		20		8		2		0		10		8		247
SAN JUAN 28-6 UNIT #433		14387	SJ 28-6		28N06W24		1		14		166		0		0		0		0		0		0		0		288
SAN JUAN 28-6 UNIT #436		14347	SJ 28-6		28N06W16		1		22		306		17		64		23		7		0		34		21		277
SAN JUAN 28-6 UNIT #437		14456	SJ 28-6		28N06W28		1		8		70		4		15		7		2		0		6		5		309
SAN JUAN 28-6 UNIT #438		14348	SJ 28-6		28N06W15		1		16		148		23		83		40		9		0		34		23		293
SAN JUAN 28-6 UNIT #439		14388	SJ 28-6		28N06W29		1		11		111		34		127		60		14		0		53		40		248
SAN JUAN 28-6 UNIT #440		13759	SJ 28-6		28N06W16		1		11		162		9		34		11		4		0		19		15		276
SAN JUAN 28-6 UNIT #441		14389	SJ 28-6		28N06W17		1		19		237		13		49		19		5		0		25		16		296
SAN JUAN 28-6 UNIT #448		13760	SJ 28-6		28N06W15		1		5		31		5		17		12		2		0		4		3		228
SAN JUAN 28-6 UNIT #449		13761	SJ 28-6		27N06W02		1		9		71		7		27		16		3		0		8		7		218
SAN JUAN 28-6 UNIT #455		13719	SJ 28-6		28N06W17		1		11		84		13		47		26		5		0		16		12		278
SAN JUAN 28-6 UNIT #456		14229	SJ 28-6		28N06W19		1		10		106		16		59		26		6		0		27		21		243
SAN JUAN 28-6 UNIT #457		13720	SJ 28-6		28N06W20		1		13		102		16		57		33		6		0		18		13		279
SAN JUAN 28-6 UNIT #458		14263	SJ 28-6		28N06W20		1		15		213		12		44		16		5		0		24		17		231
SAN JUAN 28-6 UNIT #459		13733	SJ 28-6		28N06W21		1		40		1,053		60		219		50		24		0		146		69		280
SAN JUAN 28-6 UNIT #460		13721	SJ 28-6		28N06W21		1		20		252		14		53		20		6		0		27		17		294
SAN JUAN 28-6 UNIT #461		13762	SJ 28-6		28N06W22		1		27		332		51		186		73		20		0		93		51		266
SAN JUAN 28-6 UNIT #462		13732	SJ 28-6		28N06W22		1		20		241		37		135		53		15		0		67		42		295
SAN JUAN 28-6 UNIT #467		13724	SJ 28-6		28N06W34		1		29		603		34		125		33		14		0		78		44		282
SAN JUAN 28-6 UNIT #474		13723	SJ 28-6		28N06W27		1		25		281		16		59		25		6		0		28		16		281
SAN JUAN 28-6 UNIT #475		13887	SJ 28-6		28N06W29		1		28		480		27		100		31		11		0		58		33		289
SAN JUAN 29-5 UNIT #201		14367	SJ 29-5		29N05W27		1		11		65		0		0		0		0		0		0		0		267
SAN JUAN 29-5 UNIT #203		13547	SJ 29-5		29N05W06		1		15		820		106		390		60		42		0		288		218		122
SAN JUAN 29-5 UNIT #213		13597	SJ 29-5		29N05W22		1		34		759		98		361		92		39		0		230		121		136
SAN JUAN 29-5 UNIT #217		13763	SJ 29-5		29N05W34		1		5		32		0		0		0		0		0		0		0		268
SAN JUAN 29-5 UNIT #219		14398	SJ 29-5		29N05W04		1		19		412		53		196		51		21		0		124		83		304
SAN JUAN 29-5 UNIT #223		13653	SJ 29-5		29N05W33		1		3		27		4		13		7		1		0		5		4		241
SAN JUAN 29-5 UNIT #225		14391	SJ 29-5		29N05W06		1		7		117		15		56		18		6		0		31		26		305
SAN JUAN 29-5 UNIT #226		14392	SJ 29-5		29N05W07		1		23		644		83		306		67		33		0		205		130		302
SAN JUAN 29-5 UNIT #230		14405	SJ 29-5		29N05W05		1		24		976		126		464		81		51		0		332		215		326

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 16 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.							BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE			ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$			TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 29-5 UNIT #231		14393	SJ 29-5		29N05W05		1		1		6		1		3		3			0		0		0		0		301
SAN JUAN 29-6 UNIT #201		13589	SJ 29-6		29N06W06		1		26		2,118		278		1,022		129			111		0		781		518		132
SAN JUAN 29-6 UNIT #202		13654	SJ 29-6		29N06W06		1		17		748		98		361		60			39		0		262		191		235
SAN JUAN 29-6 UNIT #203		13684	SJ 29-6		29N06W07		1		15		791		104		381		58			42		0		281		212		180
SAN JUAN 29-6 UNIT #204		13655	SJ 29-6		29N06W07		1		9		316		41		152		28			17		0		108		90		207
SAN JUAN 29-6 UNIT #205		13685	SJ 29-6		29N06W21		1		25		1,581		207		763		106			83		0		573		379		250
SAN JUAN 29-6 UNIT #206		13548	SJ 29-6		29N06W04		1		27		1,080		142		521		90			57		0		374		233		117
SAN JUAN 29-6 UNIT #207		13549	SJ 29-6		29N06W02		1		24		1,933		253		932		118			102		0		712		484		115
SAN JUAN 29-6 UNIT #208		13587	SJ 29-6		29N06W17		1		16		1,513		198		730		87			79		0		563		433		133
SAN JUAN 29-6 UNIT #209		13588	SJ 29-6		29N06W17		1		20		974		128		470		75	��		51		0		344		238		126
SAN JUAN 29-6 UNIT #210		14394	SJ 29-6		29N06W20		1		26		2,338		306		1,128		138			123		0		867		575		182
SAN JUAN 29-6 UNIT #211		14395	SJ 29-6		29N06W20		1		24		1,046		137		504		84			55		0		365		238		174
SAN JUAN 29-6 UNIT #213		13590	SJ 29-6		29N06W30		1		8		69		9		33		17			4		0		13		10		127
SAN JUAN 29-6 UNIT #214		13595	SJ 29-6		29N06W03		1		10		263		35		127		28			14		0		85		68		137
SAN JUAN 29-6 UNIT #215		13599	SJ 29-6		29N06W03		1		16		545		71		263		50			29		0		184		135		175
SAN JUAN 29-6 UNIT #216		13596	SJ 29-6		29N06W04		1		13		465		61		224		41			24		0		159		124		138
SAN JUAN 29-6 UNIT #217		13612	SJ 29-6		29N06W05		1		25		2,561		336		1,235		145			135		0		956		646		193
SAN JUAN 29-6 UNIT #218		13605	SJ 29-6		29N06W05		1		10		369		48		178		32			19		0		126		103		181
SAN JUAN 29-6 UNIT #219		13593	SJ 29-6		29N06W10		1		22		1,110		145		535		83			58		0		394		266		139
SAN JUAN 29-6 UNIT #220		13600	SJ 29-6		29N06W11		1		20		550		72		265		58			29		0		178		120		165
SAN JUAN 29-6 UNIT #221		13601	SJ 29-6		29N06W11		1		17		741		97		357		61			39		0		258		186		159
SAN JUAN 29-6 UNIT #222		13718	SJ 29-6		29N06W12		1		27		1,017		133		491		89			53		0		348		213		183
SAN JUAN 29-6 UNIT #223		13611	SJ 29-6		29N06W12		1		25		1,355		178		654		99			71		0		484		313		160
SAN JUAN 29-6 UNIT #224		13696	SJ 29-6		29N06W13		1		14		530		69		256		45			28		0		183		140		184
SAN JUAN 29-6 UNIT #225R		13947	SJ 29-6		29N06W13		1		0		0		0		0		0			0		0		0		0		332
SAN JUAN 29-6 UNIT #226		14396	SJ 29-6		29N06W14		1		24		2,469		324		1,191		140			130		0		921		631		154
SAN JUAN 29-6 UNIT #227		13765	SJ 29-6		29N06W14		1		2		9		1		4		3			0		0		0		0		155
SAN JUAN 29-6 UNIT #229		13766	SJ 29-6		29N06W35		1		21		280		37		135		50			15		0		71		44		162
SAN JUAN 29-6 UNIT #230		13602	SJ 29-6		29N06W35		1		17		219		8		30		12			3		0		15		10		140
SAN JUAN 29-6 UNIT #231		13594	SJ 29-6		29N06W36		1		0		0		0		0		0			0		0		0		0		141
SAN JUAN 29-6 UNIT #233		13767	SJ 29-6		29N06W26		1		14		247		28		103		31			11		0		60		44		176
SAN JUAN 29-6 UNIT #235		14513	SJ 29-6		29N06W34		1		29		456		60		220		71			24		0		125		69		208
SAN JUAN 29-6 UNIT #236		13694	SJ 29-6		29N06W18		1		24		1,190		156		574		90			63		0		422		278		177
SAN JUAN 29-6 UNIT #237		13674	SJ 29-6		29N06W01		1		13		417		55		201		40			22		0		139		106		197
SAN JUAN 29-6 UNIT #238		13675	SJ 29-6		29N06W01		1		11		268		35		129		30			14		0		85		68		198
SAN JUAN 29-6 UNIT #239		13676	SJ 29-6		29N06W02		1		13		472		62		228		42			25		0		161		125		170
SAN JUAN 29-6 UNIT #240		13686	SJ 29-6		29N06W18		1		24		1,667		219		804		108			88		0		609		410		251
SAN JUAN 29-6 UNIT #241		13687	SJ 29-6		29N06W19		1		30		1,828		240		882		126			96		0		660		403		252
SAN JUAN 29-6 UNIT #242		13688	SJ 29-6		29N06W19		1		31		1,828		240		882		127			96		0		659		399		178
SAN JUAN 29-6 UNIT #243		13768	SJ 29-6		29N06W31		1		17		163		6		22		11			2		0		9		6		255
SAN JUAN 29-6 UNIT #245		13667	SJ 29-6		29N06W08		1		20		1,006		132		485		75			53		0		357		250		242

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 17 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 29-6 UNIT #246		14397	SJ 29-6		29N06W08		1		3		23		3		11		7		1		0		3		3		209
SAN JUAN 29-6 UNIT #247R		13814	SJ 29-6		29N06W10		1		16		386		51		186		43		20		0		123		88		338
SAN JUAN 29-6 UNIT #249		13796	SJ 29-6		29N06W22		1		5		31		4		15		10		2		0		3		3		323
SAN JUAN 29-6 UNIT #251		13803	SJ 29-6		29N06W23		1		6		35		5		19		13		2		0		4		3		317
SAN JUAN 29-6 UNIT #257R		13815	SJ 29-6		29N06W09		1		23		918		120		443		77		48		0		318		210		339
SAN JUAN 29-6 UNIT #258		13695	SJ 29-6		29N06W16		1		22		1,488		195		718		97		78		0		542		376		186
SAN JUAN 29-6 UNIT #259		14399	SJ 29-6		29N06W09		1		11		277		36		134		31		15		0		88		69		185
SAN JUAN 29-6 UNIT #260		14400	SJ 29-6		29N06W16		1		15		304		40		146		38		16		0		92		67		187
SAN JUAN 29-6 UNIT #262		14401	SJ 29-6		29N06W21		1		33		2,359		309		1,138		151		124		0		863		518		307
SAN JUAN 29-6 UNIT #263		13802	SJ 29-6		29N06W22		1		6		53		8		29		14		3		0		12		10		320
SAN JUAN 29-6 UNIT #264		13841	SJ 29-6		29N06W27		1		7		46		6		22		14		2		0		6		5		341
SAN JUAN 29-6 UNIT #47		4888	SJ 29-6		29N06W28		1		14		424		56		205		41		22		0		141		106		1389
SAN JUAN 29-6 UNIT #68		5779	SJ 29-6		29N06W29		1		14		561		74		271		48		29		0		193		146		1392
SAN JUAN 29-7 UNIT #186		11729	SJ 29-7		29N07W21		1		11		192		23		83		23		9		0		51		40		1421
SAN JUAN 29-7 UNIT #507R		12667	SJ 29-7		29N07W13		1		19		803		95		349		58		38		0		253		178		330
SAN JUAN 29-7 UNIT #509		11718	SJ 29-7		29N07W16		1		9		200		24		87		21		9		0		57		46		1399
SAN JUAN 29-7 UNIT #519		12671	SJ 29-7		29N07W08		1		1		9		1		4		2		0		0		1		1		333
SAN JUAN 29-7 UNIT #520		12524	SJ 29-7		29N07W08		1		15		212		25		92		31		10		0		51		36		342
SAN JUAN 29-7 UNIT #521		12653	SJ 29-7		29N07W13		1		20		1,034		122		449		68		49		0		333		232		221
SAN JUAN 29-7 UNIT #526		11728	SJ 29-7		29N07W21		1		9		84		10		37		17		4		0		16		13		1373
SAN JUAN 29-7 UNIT #530		13882	SJ 29-7		29N07W34		1		25		380		45		165		53		18		0		94		56		195
SAN JUAN 29-7 UNIT #532		14349	SJ 29-7		29N07W02		1		18		345		41		150		40		16		0		93		64		145
SAN JUAN 29-7 UNIT #533		14464	SJ 29-7		29N07W03		1		6		92		11		40		13		4		0		22		19		196
SAN JUAN 29-7 UNIT #534		12668	SJ 29-7		29N07W09		1		10		119		14		52		20		6		0		26		20		327
SAN JUAN 29-7 UNIT #537		12669	SJ 29-7		29N07W22		1		9		121		14		53		19		6		0		28		23		290
SAN JUAN 29-7 UNIT #538		14402	SJ 29-7		29N07W26		1		30		618		73		268		69		29		0		170		95		200
SAN JUAN 29-7 UNIT #540		12654	SJ 29-7		29N07W10		1		14		330		39		143		33		16		0		94		71		284
SAN JUAN 29-7 UNIT #543		12655	SJ 29-7		29N07W03		1		17		476		56		207		44		23		0		140		99		299
SAN JUAN 29-7 UNIT #544		12656	SJ 29-7		29N07W04		1		29		1,997		236		868		114		95		0		659		416		283
SAN JUAN 29-7 UNIT #545		12657	SJ 29-7		29N07W12		1		28		1,999		236		869		113		95		0		661		424		210
SAN JUAN 29-7 UNIT #547		14403	SJ 29-7		29N07W07		1		27		642		76		279		65		30		0		184		109		291
SAN JUAN 29-7 UNIT #548		14372	SJ 29-7		29N07W07		1		30		570		67		248		68		27		0		152		83		300
SAN JUAN 29-7 UNIT #550		12659	SJ 29-7		29N07W11		1		16		742		88		322		50		35		0		237		177		215
SAN JUAN 29-7 UNIT #552		12652	SJ 29-7		29N07W12		1		19		1,471		174		639		80		70		0		490		359		314
SAN JUAN 29-7 UNIT #553		12661	SJ 29-7		29N07W14		1		17		1,367		161		594		74		65		0		456		342		234
SAN JUAN 29-7 UNIT #554		12662	SJ 29-7		29N07W14		1		21		498		327		1,202		277		131		0		794		523		201
SAN JUAN 29-7 UNIT #559		14404	SJ 29-7		29N07W22		1		14		162		19		70		28		8		0		35		25		244
SAN JUAN 29-7 UNIT #560		12663	SJ 29-7		29N07W23		1		5		36		16		58		32		6		0		20		18		202
SAN JUAN 29-7 UNIT #562		12664	SJ 29-7		29N07W24		1		18		1,118		132		486		68		53		0		365		265		239
SAN JUAN 29-7 UNIT #563		12665	SJ 29-7		29N07W24		1		2		16		7		25		16		3		0		7		6		285
SAN JUAN 29-7 UNIT #565		14231	SJ 29-7		29N07W26		1		12		87		57		211		124		23		0		64		46		203

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 18 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 29-7 UNIT #577		14232	SJ 29-7		29N07W35		1		9		88		7		24		11		3		0		10		8		275
SAN JUAN 29-7 UNIT #580		14465	SJ 29-7		29N07W01		1		21		1,345		159		584		79		64		0		442		312		219
SAN JUAN 29-7 UNIT #582		12666	SJ 29-7		29N07W02		1		17		1,394		165		606		75		66		0		465		351		211
SAN JUAN 29-7 UNIT #583		12670	SJ 29-7		29N07W06		1		15		282		33		122		33		13		0		76		55		329
SAN JUAN 29-7 UNIT #92R		12025	SJ 29-7		29N07W16		1		4		42		5		18		7		2		0		9		8		1248
SAN JUAN 30-5 UNIT #201		13550	SJ 30-5		30N05W19		1		24		1,643		309		1,138		155		124		0		859		573		123
SAN JUAN 30-5 UNIT #202		13551	SJ 30-5		30N05W06		1		5		137		26		95		22		10		0		63		56		116
SAN JUAN 30-5 UNIT #203		13607	SJ 30-5		30N05W06		1		3		27		5		19		9		2		0		8		7		156
SAN JUAN 30-5 UNIT #204		13726	SJ 30-5		30N05W07		1		19		408		77		283		71		31		0		180		122		163
SAN JUAN 30-5 UNIT #205		13772	SJ 30-5		30N05W07		1		12		242		46		168		44		18		0		105		81		148
SAN JUAN 30-5 UNIT #206		13711	SJ 30-5		30N05W18		1		20		952		179		659		106		72		0		481		333		166
SAN JUAN 30-5 UNIT #207		13727	SJ 30-5		30N05W18		1		16		894		168		619		93		67		0		459		340		192
SAN JUAN 30-5 UNIT #208		13665	SJ 30-5		30N05W19		1		17		1,496		282		1,036		129		113		0		795		596		199
SAN JUAN 30-5 UNIT #209		13606	SJ 30-5		30N05W30		1		18		921		173		638		97		69		0		471		342		167
SAN JUAN 30-5 UNIT #210		13682	SJ 30-5		30N05W30		1		12		366		69		254		51		28		0		175		137		264
SAN JUAN 30-5 UNIT #211		13683	SJ 30-5		30N05W31		1		16		580		109		401		73		44		0		284		210		172
SAN JUAN 30-5 UNIT #212		13617	SJ 30-5		30N05W31		1		16		539		101		373		71		41		0		262		192		173
SAN JUAN 30-5 UNIT #213R		16986	SJ 30-5		30N05W05		1		12		545		103		377		63		41		0		274		215		624
SAN JUAN 30-5 UNIT #214		16987	SJ 30-5		30N05W05		1		10		532		100		368		55		40		0		274		228		638
SAN JUAN 30-5 UNIT #215		13660	SJ 30-5		30N05W08		1		20		1,197		225		829		119		90		0		620		437		190
SAN JUAN 30-5 UNIT #216R		13943	SJ 30-5		30N05W20		1		13		394		74		273		57		30		0		186		142		335
SAN JUAN 30-5 UNIT #217		13614	SJ 30-5		30N05W21		1		22		1,227		231		850		125		93		0		632		435		217
SAN JUAN 30-5 UNIT #218		13659	SJ 30-5		30N05W17		1		8		513		97		355		49		39		0		267		231		191
SAN JUAN 30-5 UNIT #219R		17250	SJ 30-5		30N05W16		1		11		559		105		387		59		42		0		286		233		625
SAN JUAN 30-5 UNIT #220R		15532	SJ 30-5		30N05W08		1		17		674		127		467		82		51		0		334		241		635
SAN JUAN 30-5 UNIT #223		13677	SJ 30-5		30N05W20		1		16		762		143		528		83		57		0		387		289		236
SAN JUAN 30-5 UNIT #224		12576	SJ 30-5		30N05W17		1		14		387		73		268		58		29		0		181		136		237
SAN JUAN 30-5 UNIT #225		14406	SJ 30-5		30N05W29		1		16		431		81		298		65		32		0		201		146		306
SAN JUAN 30-5 UNIT #226		13670	SJ 30-5		30N05W29		1		19		1,059		199		733		109		80		0		545		389		261
SAN JUAN 30-5 UNIT #227		13672	SJ 30-5		30N05W28		1		20		746		140		517		95		56		0		366		249		232
SAN JUAN 30-5 UNIT #228		14407	SJ 30-5		30N05W28		1		19		589		111		408		82		44		0		281		194		310
SAN JUAN 30-5 UNIT #229		13673	SJ 30-5		30N05W21		1		23		1,290		243		893		133		97		0		663		442		270
SAN JUAN 30-5 UNIT #230		14366	SJ 30-5		30N05W32		1		9		492		93		340		51		37		0		253		213		238
SAN JUAN 30-5 UNIT #231		14409	SJ 30-5		30N05W32		1		17		408		77		282		68		31		0		184		129		233
SAN JUAN 30-5 UNIT #232		14408	SJ 30-5		30N05W33		1		0		0		0		0		0		0		0		0		0		321
SAN JUAN 30-5 UNIT #233		14443	SJ 30-5		30N05W33		1		22		705		133		488		98		53		0		337		220		322
SAN JUAN 30-5 UNIT #234		14410	SJ 30-5		30N05W22		1		28		2,555		481		1,769		216		193		0		1,361		880		318
SAN JUAN 30-5 UNIT #235		14411	SJ 30-5		30N05W27		1		10		299		56		207		43		23		0		141		114		311
SAN JUAN 30-5 UNIT #236		14412	SJ 30-5		30N05W27		1		8		240		45		166		34		18		0		115		97		303
SAN JUAN 30-5 UNIT #237R		6123	SJ 30-5		30N05W16		1		8		369		69		255		42		28		0		185		157		1201
SAN JUAN 30-5 UNIT #238		14414	SJ 30-5		30N05W34		1		6		146		27		101		24		11		0		66		57		312

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 19 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 30-5 UNIT #239		13949	SJ 30-5		30N05W15		1		13		716		135		496		74		54		0		367		288		315
SAN JUAN 30-5 UNIT #240		14415	SJ 30-5		30N05W22		1		27		2,111		397		1,462		189		159		0		1,114		723		324
SAN JUAN 30-5 UNIT #241		14416	SJ 30-5		30N05W23		1		14		314		59		218		55		24		0		139		102		325
SAN JUAN 30-5 UNIT #242		14444	SJ 30-5		30N05W34		1		4		44		8		31		14		3		0		13		12		316
SAN JUAN 30-5 UNIT #243		14069	SJ 30-5		30N05W15		1		27		2,291		431		1,587		198		173		0		1,215		795		346
SAN JUAN 30-5 UNIT #246		13948	SJ 30-5		30N05W26		1		17		566		106		392		75		43		0		274		197		331
SAN JUAN 30-5 UNIT #249		14068	SJ 30-5		30N05W23		1		15		1,049		197		727		97		79		0		551		426		632
SAN JUAN 30-5 UNIT #255		13842	SJ 30-5		30N05W14		1		15		1,096		206		759		99		83		0		577		446		340
SAN JUAN 30-5 UNIT #257		14025	SJ 30-5		30N05W11		1		22		2,259		425		1,564		184		170		0		1,210		853		345
SAN JUAN 30-5 UNIT #258		14026	SJ 30-5		30N05W14		1		30		3,678		692		2,547		283		277		0		1,987		1,285		344
SAN JUAN 30-5 UNIT #259		8011	SJ 30-5		30N05W13		1		14		597		112		414		71		45		0		298		226		630
SAN JUAN 30-5 UNIT #260		12646	SJ 30-5		30N05W09		1		10		958		180		663		80		72		0		511		430		633
SAN JUAN 30-5 UNIT #261		5424	SJ 30-5		30N05W11		1		26		1,513		285		1,048		153		114		0		780		501		682
SAN JUAN 30-5 UNIT #262		8012	SJ 30-5		30N05W12		1		12		932		175		645		83		70		0		492		398		631
SAN JUAN 30-5 UNIT #263		5425	SJ 30-5		30N05W13		1		9		369		69		255		44		28		0		184		154		683
SAN JUAN 30-5 UNIT #264		12619	SJ 30-5		30N05W09		1		12		1,053		198		729		90		79		0		560		455		634
SAN JUAN 30-5 UNIT #265		15533	SJ 30-5		30N05W10		1		14		1,651		311		1,144		128		125		0		891		713		637
SAN JUAN 30-5 UNIT #266		15534	SJ 30-5		30N05W10		1		20		2,380		448		1,648		184		180		0		1,285		947		636
SAN JUAN 30-5 UNIT #267		5046	SJ 30-5		30N05W24		1		11		401		76		278		51		30		0		197		159		1246
SAN JUAN 30-5 UNIT #268		10177	SJ 30-5		30N05W24		1		12		381		72		264		54		29		0		182		141		1247
SAN JUAN 30-6 UNIT #400		14164	SJ 30-6		30N07W14		1		20		1,536		77		282		37		31		0		215		153		23
SAN JUAN 30-6 UNIT #401R		14165	SJ 30-6		30N07W13		1		16		1,089		54		200		27		22		0		151		114		79
SAN JUAN 30-6 UNIT #403		13648	SJ 30-6		30N06W09		1		27		2,154		108		396		51		43		0		302		198		171
SAN JUAN 30-6 UNIT #404R		14459	SJ 30-6		30N07W23		1		22		2,253		112		414		49		45		0		320		226		328
SAN JUAN 30-6 UNIT #405		13580	SJ 30-6		30N06W09		1		19		717		36		132		24		14		0		94		65		128
SAN JUAN 30-6 UNIT #406R		14167	SJ 30-6		30N07W15		1		17		816		41		150		24		16		0		110		81		108
SAN JUAN 30-6 UNIT #407		13559	SJ 30-6		30N06W16		1		23		1,807		90		332		43		36		0		253		172		120
SAN JUAN 30-6 UNIT #408		13558	SJ 30-6		30N06W16		1		23		1,597		80		293		40		32		0		222		151		119
SAN JUAN 30-6 UNIT #409		14168	SJ 30-6		30N07W25		1		23		2,285		114		420		50		46		0		324		226		30
SAN JUAN 30-6 UNIT #410		14211	SJ 30-6		30N06W26		1		18		865		43		159		26		17		0		116		83		135
SAN JUAN 30-6 UNIT #411		14169	SJ 30-6		30N07W27		1		11		485		24		89		15		10		0		64		52		33
SAN JUAN 30-6 UNIT #412		14170	SJ 30-6		30N07W24		1		21		1,878		94		345		43		38		0		265		187		24
SAN JUAN 30-6 UNIT #413R		14171	SJ 30-6		30N07W23		1		23		1,808		90		332		43		36		0		253		175		84
SAN JUAN 30-6 UNIT #414		14172	SJ 30-6		30N07W35		1		11		306		15		56		12		6		0		38		30		25
SAN JUAN 30-6 UNIT #415		14173	SJ 30-6		30N07W26		1		21		1,549		77		285		38		31		0		216		152		32
SAN JUAN 30-6 UNIT #416		14174	SJ 30-6		30N07W24		1		23		2,535		127		466		54		51		0		361		251		28
SAN JUAN 30-6 UNIT #417		14175	SJ 30-6		30N07W25		1		19		1,456		73		267		35		29		0		203		147		29
SAN JUAN 30-6 UNIT #418		14176	SJ 30-6		30N07W26		1		20		1,615		81		297		38		32		0		226		163		31
SAN JUAN 30-6 UNIT #419		14177	SJ 30-6		30N07W11		1		13		460		23		85		16		9		0		59		46		26
SAN JUAN 30-6 UNIT #420		14178	SJ 30-6		30N07W12		1		20		896		45		165		27		18		0		119		82		27
SAN JUAN 30-6 UNIT #421		14179	SJ 30-6		30N07W34		1		0		0		0		0		0		0		0		0		0		37

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 20 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 30-6 UNIT #422		14264	SJ 30-6		30N07W27		1		22		1,008		50		185		30		20		0		135		90		59
SAN JUAN 30-6 UNIT #423		14462	SJ 30-6		30N07W28		1		8		153		8		28		8		3		0		17		14		95
SAN JUAN 30-6 UNIT #424		14463	SJ 30-6		30N07W33		1		18		590		29		108		21		12		0		75		53		56
SAN JUAN 30-6 UNIT #425		14385	SJ 30-6		30N07W33		1		22		1,387		69		255		36		28		0		191		132		47
SAN JUAN 30-6 UNIT #426		14180	SJ 30-6		30N07W34		1		9		153		8		28		8		3		0		17		13		54
SAN JUAN 30-6 UNIT #427		14181	SJ 30-6		30N07W35		1		14		615		31		113		19		12		0		81		62		60
SAN JUAN 30-6 UNIT #428		14358	SJ 30-6		30N07W28		1		21		1,055		53		194		30		21		0		142		98		82
SAN JUAN 30-6 UNIT #429		14359	SJ 30-6		30N07W32		1		13		657		33		121		19		13		0		89		70		67
SAN JUAN 30-6 UNIT #430		13543	SJ 30-6		30N06W08		1		18		1,446		72		266		34		29		0		203		151		38
SAN JUAN 30-6 UNIT #431		13544	SJ 30-6		30N06W10		1		24		1,992		99		366		47		40		0		280		189		40
SAN JUAN 30-6 UNIT #432		13545	SJ 30-6		30N06W10		1		25		1,623		81		298		42		32		0		224		148		39
SAN JUAN 30-6 UNIT #433		14182	SJ 30-6		30N06W11		1		16		829		41		152		24		17		0		112		83		48
SAN JUAN 30-6 UNIT #434		14183	SJ 30-6		30N06W12		1		18		1,140		57		209		29		23		0		157		116		58
SAN JUAN 30-6 UNIT #435		14184	SJ 30-6		30N06W13		1		21		1,213		61		223		33		24		0		166		114		70
SAN JUAN 30-6 UNIT #436		14185	SJ 30-6		30N06W15		1		21		1,589		79		292		38		32		0		222		157		41
SAN JUAN 30-6 UNIT #437		14186	SJ 30-6		30N06W11		1		27		1,938		97		356		48		39		0		270		174		62
SAN JUAN 30-6 UNIT #438		14187	SJ 30-6		30N06W12		1		21		1,953		98		359		43		39		0		276		199		68
SAN JUAN 30-6 UNIT #439		14188	SJ 30-6		30N06W14		1		21		1,073		54		197		31		21		0		145		99		49
SAN JUAN 30-6 UNIT #440		14189	SJ 30-6		30N06W15		1		3		23		1		4		2		0		0		2		2		50
SAN JUAN 30-6 UNIT #441		14190	SJ 30-6		30N06W31		1		1		8		0		2		1		0		0		0		0		53
SAN JUAN 30-6 UNIT #442		13568	SJ 30-6		30N06W14		1		21		1,505		75		277		37		30		0		209		147		96
SAN JUAN 30-6 UNIT #443		13532	SJ 30-6		30N06W36		1		1		4		0		1		1		0		0		0		0		69
SAN JUAN 30-6 UNIT #444		14208	SJ 30-6		30N06W36		1		27		1,634		82		300		43		33		0		224		143		66
SAN JUAN 30-6 UNIT #445		14209	SJ 30-6		30N06W13		1		21		1,255		63		231		33		25		0		172		120		73
SAN JUAN 30-6 UNIT #446		14204	SJ 30-6		30N06W35		1		25		2,467		123		453		54		49		0		350		236		129
SAN JUAN 30-6 UNIT #447		14206	SJ 30-6		30N07W31		1		13		324		16		60		14		6		0		39		30		147
SAN JUAN 30-6 UNIT #450		13536	SJ 30-6		30N06W07		1		21		1,579		79		290		38		32		0		221		156		43
SAN JUAN 30-6 UNIT #451		13534	SJ 30-6		30N06W07		1		19		1,558		78		286		37		31		0		218		158		42
SAN JUAN 30-6 UNIT #452		13535	SJ 30-6		30N06W08		1		16		836		42		154		24		17		0		113		84		61
SAN JUAN 30-6 UNIT #453		14191	SJ 30-6		30N06W17		1		19		955		48		175		27		19		0		129		92		57
SAN JUAN 30-6 UNIT #454		14192	SJ 30-6		30N06W17		1		22		1,701		85		312		41		34		0		238		164		44
SAN JUAN 30-6 UNIT #455		14161	SJ 30-6		30N06W18		1		19		939		47		173		27		19		0		127		90		52
SAN JUAN 30-6 UNIT #456		13537	SJ 30-6		30N06W18		1		22		2,179		109		400		48		44		0		309		218		51
SAN JUAN 30-6 UNIT #457		14193	SJ 30-6		30N06W19		1		24		2,141		107		393		49		43		0		302		206		45
SAN JUAN 30-6 UNIT #458		14194	SJ 30-6		30N06W19		1		17		811		40		149		24		16		0		109		80		63
SAN JUAN 30-6 UNIT #459		14195	SJ 30-6		30N06W20		1		23		1,602		80		294		40		32		0		222		152		64
SAN JUAN 30-6 UNIT #460		14162	SJ 30-6		30N06W20		1		19		1,292		64		237		32		26		0		179		129		55
SAN JUAN 30-6 UNIT #461		14251	SJ 30-6		30N07W11		1		15		562		28		103		19		11		0		73		55		80
SAN JUAN 30-6 UNIT #462		14196	SJ 30-6		30N07W12		1		29		1,556		78		286		43		31		0		211		130		83
SAN JUAN 30-6 UNIT #463		14197	SJ 30-6		30N07W13		1		17		1,013		51		186		27		20		0		139		103		81
SAN JUAN 30-6 UNIT #464		14198	SJ 30-6		30N07W14		1		18		691		34		127		23		14		0		90		64		46

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 21 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 30-6 UNIT #465		14199	SJ 30-6		30N07W15		1		20		1,160		58		213		31		23		0		159		111		65
SAN JUAN 30-6 UNIT #466		14200	SJ 30-6		30N07W22		1		12		504		25		93		16		10		0		66		52		75
SAN JUAN 30-6 UNIT #467 COM		4496	NEBU		30N07W22		1		12		435		12		45		8		5		0		31		25		105
SAN JUAN 30-6 UNIT #468		14252	SJ 30-6		30N07W36		1		22		1,836		92		337		43		37		0		258		179		91
SAN JUAN 30-6 UNIT #470		14253	SJ 30-6		30N06W21		1		19		1,173		59		216		31		23		0		161		115		102
SAN JUAN 30-6 UNIT #471		14254	SJ 30-6		30N06W21		1		18		1,088		54		200		29		22		0		150		110		113
SAN JUAN 30-6 UNIT #472		14255	SJ 30-6		30N06W22		1		17		521		26		96		20		10		0		65		46		107
SAN JUAN 30-6 UNIT #473		14256	SJ 30-6		30N06W22		1		16		719		36		132		22		14		0		96		71		106
SAN JUAN 30-6 UNIT #474		14257	SJ 30-6		30N06W27		1		27		2,208		110		406		51		44		0		310		203		97
SAN JUAN 30-6 UNIT #475		14258	SJ 30-6		30N06W27		1		28		2,776		139		510		61		56		0		393		255		109
SAN JUAN 30-6 UNIT #476		14163	SJ 30-6		30N06W28		1		20		1,297		65		238		33		26		0		179		126		100
SAN JUAN 30-6 UNIT #477		14210	SJ 30-6		30N06W28		1		23		1,966		98		361		45		39		0		277		191		111
SAN JUAN 30-6 UNIT #478		14205	SJ 30-6		30N06W29		1		22		1,829		91		336		43		37		0		257		179		101
SAN JUAN 30-6 UNIT #479		14259	SJ 30-6		30N06W29		1		21		1,278		64		235		34		26		0		176		122		134
SAN JUAN 30-6 UNIT #480		14260	SJ 30-6		30N06W30		1		14		639		32		117		20		13		0		85		65		110
SAN JUAN 30-6 UNIT #481		14261	SJ 30-6		30N06W30		1		26		2,350		117		432		53		47		0		332		222		99
SAN JUAN 30-6 UNIT #482		14266	SJ 30-6		30N06W31		1		28		2,537		127		466		58		51		0		358		231		142
SAN JUAN 30-6 UNIT #483		14207	SJ 30-6		30N06W34		1		15		524		26		96		18		10		0		68		51		104
SAN JUAN 30-6 UNIT #484		14249	SJ 30-6		30N06W34		1		5		103		5		19		5		2		0		12		11		103
SAN JUAN 30-6 UNIT #485		14233	SJ 30-6		30N07W36		1		19		1,377		69		253		34		28		0		192		139		204
SAN JUAN 30-6 UNIT #486		14234	SJ 30-6		30N06W23		1		23		1,787		89		328		42		36		0		250		173		271
SAN JUAN 30-6 UNIT #487		14235	SJ 30-6		30N06W23		1		25		1,739		87		320		43		35		0		242		161		292
SAN JUAN 30-6 UNIT #488		14236	SJ 30-6		30N06W24		1		16		553		28		102		19		11		0		71		52		222
SAN JUAN 30-6 UNIT #489		14237	SJ 30-6		30N06W24		1		19		1,517		76		279		36		30		0		212		153		249
SAN JUAN 30-6 UNIT #490		14238	SJ 30-6		30N06W25		1		10		342		17		63		12		7		0		44		36		223
SAN JUAN 30-6 UNIT #491		14239	SJ 30-6		30N06W25		1		18		1,042		52		192		28		21		0		142		103		224
SAN JUAN 30-6 UNIT #492		14240	SJ 30-6		30N06W26		1		18		758		38		139		24		15		0		100		72		230
SAN JUAN 30-6 UNIT #493		14241	SJ 30-6		30N06W32		1		15		649		32		119		20		13		0		86		64		205
SAN JUAN 30-6 UNIT #494		14242	SJ 30-6		30N06W33		1		29		2,916		146		536		63		58		0		414		268		212
SAN JUAN 30-6 UNIT #495		14243	SJ 30-6		30N06W33		1		25		1,763		88		324		44		35		0		245		163		213
SAN JUAN 30-6 UNIT #496		14244	SJ 30-6		30N06W35		1		16		531		27		98		19		11		0		68		49		225
SAN JUAN 30-6 UNIT #497		14245	SJ 30-6		30N07W29		1		29		942		47		173		35		19		0		120		70		259
SAN JUAN 30-6 UNIT #498R		13946	SJ 30-6		30N07W30		1		3		21		3		12		7		1		0		3		3		336
SAN JUAN 30-6 UNIT #500		14417	SJ 30-6		30N07W31		1		19		298		44		163		54		18		0		91		59		240
SAN JUAN 30-6 UNIT #501		14248	SJ 30-6		30N06W32		1		20		1,145		57		210		31		23		0		157		111		206
SAN JUAN 31 FED 3 #2		14418	NON-UNIT		31N09W03		1		21		1,342		199		733		106		80		0		548		380		559
SAN JUAN 31-6 UNIT #201		13540	SJ 31-6		30N06W01		1		14		487		52		192		37		21		0		134		103		130
SAN JUAN 31-6 UNIT #202		13552	SJ 31-6		30N06W01		1		28		2,046		219		806		109		88		0		610		391		118
SAN JUAN 31-6 UNIT #203		13539	SJ 31-6		30N06W03		1		10		249		27		98		24		11		0		64		51		88
SAN JUAN 31-6 UNIT #204		13541	SJ 31-6		30N06W03		1		20		1,244		133		490		70		53		0		366		261		90
SAN JUAN 31-6 UNIT #205R		12574	SJ 31-6		30N06W04		1		10		432		46		170		29		19		0		123		101		343

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 22 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 31-6 UNIT #206		13542	SJ 31-6		30N06W04		1		11		507		54		200		33		22		0		145		117		92
SAN JUAN 31-6 UNIT #207		13533	SJ 31-6		30N06W06		1		17		580		62		229		45		25		0		158		113		94
SAN JUAN 31-6 UNIT #208		14213	SJ 31-6		30N06W06		1		11		186		20		73		22		8		0		43		34		89
SAN JUAN 31-6 UNIT #209		14214	SJ 31-6		30N07W01		1		9		286		31		113		24		12		0		77		63		87
SAN JUAN 31-6 UNIT #210		13618	SJ 31-6		30N06W02		1		21		1,852		198		730		92		80		0		559		398		168
SAN JUAN 31-6 UNIT #211		13553	SJ 31-6		30N06W02		1		25		1,916		205		755		101		82		0		572		380		114
SAN JUAN 31-6 UNIT #212		13615	SJ 31-6		30N06W05		1		14		835		89		329		49		36		0		244		187		164
SAN JUAN 31-6 UNIT #213		13554	SJ 31-6		30N06W05		1		17		935		100		369		56		40		0		272		200		121
SAN JUAN 31-6 UNIT #214		13646	SJ 31-6		31N06W36		1		12		388		42		153		30		17		0		106		84		254
SAN JUAN 31-6 UNIT #215		13616	SJ 31-6		31N06W36		1		22		979		105		386		66		42		0		278		186		150
SAN JUAN 31-6 UNIT #216		13647	SJ 31-6		31N06W35		1		19		666		71		263		50		29		0		184		128		287
SAN JUAN 31-6 UNIT #217		13609	SJ 31-6		31N06W35		1		4		33		4		13		7		1		0		5		4		157
SAN JUAN 31-6 UNIT #218		13671	SJ 31-6		31N06W34		1		16		563		60		222		42		24		0		155		114		265
SAN JUAN 31-6 UNIT #219		13608	SJ 31-6		31N06W34		1		29		1,893		203		746		106		81		0		559		348		158
SAN JUAN 31-6 UNIT #220R		18278	SJ 31-6		31N06W33		1		0		0		0		0		0		0		0		0		0		641
SAN JUAN 31-6 UNIT #221		13656	SJ 31-6		31N06W33		1		25		856		92		337		66		37		0		234		146		253
SAN JUAN 31-6 UNIT #222		13666	SJ 31-6		31N06W32		1		9		192		21		76		20		8		0		47		38		220
SAN JUAN 31-6 UNIT #223		13613	SJ 31-6		31N06W32		1		27		1,732		186		683		98		74		0		510		325		149
SAN JUAN 31-6 UNIT #224		13691	SJ 31-6		31N06W31		1		13		401		43		158		33		17		0		108		83		274
SAN JUAN 31-6 UNIT #225R		13697	SJ 31-6		31N06W31		1		16		663		71		261		47		28		0		186		136		263
SAN JUAN 31-6 UNIT #228		14419	SJ 31-6		31N06W28		1		11		449		48		177		32		19		0		126		101		272
SAN JUAN 31-6 UNIT #229R		18279	SJ 31-6		31N06W28		1		13		328		35		129		30		14		0		85		65		640
SAN JUAN 31-6 UNIT #230		13555	SJ 31-6		31N06W27		1		23		1,104		118		435		71		47		0		317		211		125
SAN JUAN 31-6 UNIT #231R		17256	SJ 31-6		31N06W27		1		12		332		36		131		29		14		0		88		68		627
SAN JUAN 31-6 UNIT #232		13692	SJ 31-6		30N07W01		1		9		200		21		79		20		9		0		51		42		262
SAN JUAN 31-6 UNIT #233		13693	SJ 31-6		31N06W29		1		23		676		72		267		57		29		0		181		116		227
SAN JUAN 31-6 UNIT #234R		14007	SJ 31-6		31N06W29		1		6		94		10		37		13		4		0		21		18		337
SAN JUAN 32-7 UNIT #202R		10783	SJ 32-7		32N07W18		1		13		471		70		257		49		28		0		181		137		1449
SAN JUAN 32-7 UNIT #203R		12467	SJ 32-7		32N07W22		1		28		2,377		403		1,484		193		162		0		1,129		724		621
SAN JUAN 32-7 UNIT #204		13546	SJ 32-7		32N07W36		1		16		1,312		223		819		108		89		0		622		470		412
SAN JUAN 32-7 UNIT #205		12471	SJ 32-7		32N07W22		1		16		1,793		304		1,119		133		122		0		864		664		1403
SAN JUAN 32-7 UNIT #206		12647	SJ 32-7		32N07W27		1		12		744		126		464		67		51		0		346		279		656
SAN JUAN 32-7 UNIT #207		13698	SJ 32-7		32N07W27		1		20		1,845		313		1,151		144		125		0		882		639		468
SAN JUAN 32-7 UNIT #208		13710	SJ 32-7		32N07W34		1		16		1,564		265		976		121		106		0		749		572		469
SAN JUAN 32-7 UNIT #209		13640	SJ 32-7		32N07W35		1		13		1,072		182		669		87		73		0		509		407		476
SAN JUAN 32-7 UNIT #210		13598	SJ 32-7		32N07W36		1		17		1,216		206		759		105		83		0		571		426		433
SAN JUAN 32-7 UNIT #211R		12642	SJ 32-7		32N07W35		1		14		819		139		511		77		56		0		378		291		618
SAN JUAN 32-7 UNIT #213 COM		4832	SJ 32-7		31N07W07		1		21		1,105		118		435		69		47		0		319		220		573
SAN JUAN 32-7 UNIT #214		13717	SJ 32-7		32N07W34		1		8		166		28		103		29		11		0		63		52		551
SAN JUAN 32-7 UNIT #215		13700	SJ 32-7		32N07W32		1		19		1,366		232		853		117		93		0		643		468		481
SAN JUAN 32-7 UNIT #216		14422	SJ 32-7		31N07W04		1		7		102		17		64		22		7		0		35		30		581

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 23 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 32-7 UNIT #217		13701	SJ 32-7		31N07W04		1		13		360		61		224		51		24		0		149		114		570
SAN JUAN 32-7 UNIT #218		13702	SJ 32-7		31N07W05		1		25		1,754		297		1,095		151		119		0		824		550		571
SAN JUAN 32-7 UNIT #219		13703	SJ 32-7		31N07W05		1		19		1,391		236		868		120		95		0		654		469		572
SAN JUAN 32-7 UNIT #220 COM		4835	SJ 32-7		31N07W05		1		20		1,518		225		828		113		90		0		626		444		619
SAN JUAN 32-7 UNIT #221		13704	SJ 32-7		31N07W08		1		13		671		114		419		67		46		0		306		238		552
SAN JUAN 32-7 UNIT #222		14423	SJ 32-7		32N07W20		1		17		989		168		617		93		67		0		456		335		588
SAN JUAN 32-7 UNIT #224 COM		4792	SJ 32-7		32N07W21		1		25		1,969		250		922		122		100		0		699		466		582
SAN JUAN 32-7 UNIT #227 COM		4843	SJ 32-7		31N07W18		1		18		855		109		401		66		44		0		291		210		574
SAN JUAN 32-7 UNIT #228		4816	SJ 32-7		31N07W07		1		16		1,504		130		479		60		52		0		367		278		617
SAN JUAN 32-7 UNIT #229		13729	SJ 32-7		31N07W09		1		16		794		135		496		81		54		0		361		266		566
SAN JUAN 32-7 UNIT #230		12620	SJ 32-7		31N07W17		1		18		1,193		202		745		105		81		0		559		411		616
SAN JUAN 32-7 UNIT #231		13664	SJ 32-7		31N07W17		1		17		460		78		287		65		31		0		190		134		567
SAN JUAN 32-7 UNIT #232		13705	SJ 32-7		31N07W08		1		12		349		59		218		47		24		0		147		114		556
SAN JUAN 32-7 UNIT #233		14452	SJ 32-7		32N07W20		1		16		1,161		197		725		101		79		0		545		409		592
SAN JUAN 32-7 UNIT #234		14425	SJ 32-7		32N07W32		1		18		1,381		234		862		115		94		0		653		483		583
SAN JUAN 32-7 UNIT #235		14426	SJ 32-7		32N07W29		1		14		1,373		233		857		106		93		0		658		520		589
SAN JUAN 32-7 UNIT #237		14454	SJ 32-7		32N07W32		1		13		1,133		192		707		91		77		0		539		430		1408
SAN JUAN 32-7 UNIT #238		14455	SJ 32-7		32N07W29		1		24		2,833		480		1,768		206		193		0		1,369		945		593
SAN JUAN 32-7 UNIT #240		12579	SJ 32-7		32N07W19		1		14		612		104		382		66		42		0		274		209		1404
SAN JUAN 32-7 UNIT #241		12580	SJ 32-7		32N07W21		1		13		1,592		270		994		115		108		0		770		618		1405
SAN JUAN 32-7 UNIT #242		12643	SJ 32-7		32N07W33		1		12		940		159		587		77		64		0		445		362		657
SAN JUAN 32-7 UNIT #243		17813	SJ 32-7		32N07W19		1		20		783		133		489		91		53		0		345		235		1410
SAN JUAN 32-7 UNIT #244		15582	SJ 32-7		32N07W17		1		22		994		169		620		105		68		0		448		302		1409
SAN JUAN 32-7 UNIT #246		740	SJ 32-7		32N07W18		1		18		1,030		175		643		97		70		0		476		346		1172
SAN JUAN 32-8 UNIT #202		13657	SJ 32-8		32N08W27		1		19		2,023		230		846		99		92		0		654		486		432
SAN JUAN 32-8 UNIT #203		14507	SJ 32-8		32N08W33		1		18		1,741		198		728		88		79		0		560		420		584
SAN JUAN 32-8 UNIT #204		14508	SJ 32-8		32N08W34		1		19		1,778		202		744		92		81		0		571		418		585
SAN JUAN 32-8 UNIT #205		14511	SJ 32-8		32N08W34		1		13		1,102		125		461		58		50		0		352		283		590
SAN JUAN 32-8 UNIT #206		14445	SJ 32-8		31N08W24		1		13		509		58		213		39		23		0		150		115		548
SAN JUAN 32-8 UNIT #207		13591	SJ 32-8		31N08W22		1		21		1,477		168		618		85		67		0		466		328		414
SAN JUAN 32-8 UNIT #208		13557	SJ 32-8		32N08W29		1	��	26		2,331		265		975		122		106		0		747		498		419
SAN JUAN 32-8 UNIT #213		12648	SJ 32-8		32N08W22		1		18		1,122		128		469		68		51		0		350		253		614
SAN JUAN 32-8 UNIT #218		14509	SJ 32-8		32N08W35		1		11		1,174		133		491		58		53		0		380		316		586
SAN JUAN 32-8 UNIT #219		14510	SJ 32-8		32N08W35		1		20		2,385		271		997		114		109		0		774		566		587
SAN JUAN 32-8 UNIT #220		13706	SJ 32-8		31N08W24		1		13		555		63		232		40		25		0		167		130		544
SAN JUAN 32-8 UNIT #221		13642	SJ 32-8		31N08W09		1		14		760		86		318		48		35		0		235		182		499
SAN JUAN 32-8 UNIT #222		13658	SJ 32-8		31N08W09		1		24		1,441		164		602		88		66		0		449		301		500
SAN JUAN 32-8 UNIT #223		13643	SJ 32-8		31N08W10		1		17		748		85		313		53		34		0		225		163		488
SAN JUAN 32-8 UNIT #224		13644	SJ 32-8		31N08W10		1		29		2,308		262		965		126		105		0		734		465		486
SAN JUAN 32-8 UNIT #225		14427	SJ 32-8		31N08W15		1		24		1,817		206		760		101		83		0		576		388		517
SAN JUAN 32-8 UNIT #226		13707	SJ 32-8		31N08W15		1		23		1,685		191		705		95		77		0		533		363		487

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 24 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 32-8 UNIT #227		14428	SJ 32-8		31N08W16		1		14		661		75		276		46		30		0		200		152		473
SAN JUAN 32-8 UNIT #228		14429	SJ 32-8		31N08W16		1		18		1,235		140		516		72		56		0		388		283		471
SAN JUAN 32-8 UNIT #229		13708	SJ 32-8		32N08W20		1		21		2,297		261		960		112		105		0		744		539		501
SAN JUAN 32-8 UNIT #230		13716	SJ 32-8		32N08W28		1		16		2,107		239		881		98		96		0		687		538		510
SAN JUAN 32-8 UNIT #231		13715	SJ 32-8		32N08W28		1		16		1,656		188		692		83		75		0		534		410		511
SAN JUAN 32-8 UNIT #232		13709	SJ 32-8		32N08W29		1		21		2,345		266		981		115		107		0		759		546		502
SAN JUAN 32-8 UNIT #233		13712	SJ 32-8		32N08W30		1		19		3,451		392		1,443		149		157		0		1,137		864		512
SAN JUAN 32-8 UNIT #234		14430	SJ 32-8		31N08W21		1		12		633		72		265		42		29		0		194		154		565
SAN JUAN 32-8 UNIT #235		14431	SJ 32-8		31N08W21		1		15		536		61		224		42		24		0		158		118		564
SAN JUAN 32-8 UNIT #236		14432	SJ 32-8		31N08W22		1		17		1,242		141		520		71		57		0		392		291		577
SAN JUAN 32-8 UNIT #237		13645	SJ 32-8		31N08W23		1		17		762		87		319		53		35		0		231		169		539
SAN JUAN 32-8 UNIT #238		13652	SJ 32-8		31N08W23		1		16		1,291		147		540		70		59		0		411		313		538
SAN JUAN 32-8 UNIT #239		13714	SJ 32-8		32N08W30		1		18		1,441		164		603		79		66		0		458		337		569
SAN JUAN 32-8 UNIT #240		13725	SJ 32-8		31N08W03		1		15		1,137		129		475		63		52		0		361		279		553
SAN JUAN 32-8 UNIT #241		13713	SJ 32-8		31N08W04		1		15		942		107		394		56		43		0		295		227		554
SAN JUAN 32-8 UNIT #242		14433	SJ 32-8		31N08W04		1		19		1,292		147		540		75		59		0		406		294		576
SAN JUAN 32-8 UNIT #243		14434	SJ 32-8		31N08W11		1		20		1,163		132		486		72		53		0		362		257		555
SAN JUAN 32-8 UNIT #244		13730	SJ 32-8		31N08W14		1		21		1,673		190		700		92		76		0		532		374		562
SAN JUAN 32-8 UNIT #245		14435	SJ 32-8		31N08W14		1		14		770		88		322		50		35		0		237		182		563
SAN JUAN 32-8 UNIT #247		12555	SJ 32-8		32N08W19		1		21		2,818		320		1,179		131		128		0		919		667		1195
SAN JUAN 32-8 UNIT #248		14436	SJ 32-8		31N08W11		1		15		599		68		251		45		27		0		178		133		1371
SAN JUAN 32-8 UNIT #249		14437	SJ 32-8		31N08W03		1		18		1,263		144		528		73		58		0		398		291		557
SAN JUAN 32-8 UNIT #250		13731	SJ 32-8		32N08W33		1		18		1,457		166		609		78		66		0		464		346		558
SAN JUAN 32-8 UNIT #253		12649	SJ 32-8		32N08W27		1		15		1,098		125		459		61		50		0		348		270		615
SAN JUAN 32-8 UNIT #254		14084	SJ 32-8		32N08W23		1		15		602		68		252		45		27		0		180		135		622
SAN JUAN 32-8 UNIT #255		1874	SJ 32-8		32N08W24		1		14		431		49		180		37		20		0		123		93		1196
SAN JUAN 32-8 UNIT #256		19424	SJ 32-8		32N08W25		1		19		2,063		234		863		101		94		0		667		494		628
SAN JUAN 32-8 UNIT #257		16981	SJ 32-8		32N08W19		1		19		2,081		236		870		102		95		0		673		499		1197
SAN JUAN 32-8 UNIT #258		19425	SJ 32-8		32N08W15		1		15		620		70		259		45		28		0		186		140		1359
SAN JUAN 32-8 UNIT #259A		5043	SJ 32-8		32N08W22		1		15		981		111		410		59		45		0		307		233		724
SAN JUAN 32-8 UNIT #260		19426	SJ 32-8		32N08W18		1		15		1,310		149		548		70		60		0		418		323		1361
SAN JUAN 32-8 UNIT #261		17021	SJ 32-8		32N08W17		1		13		542		62		227		40		25		0		162		125		1198
SAN JUAN 32-8 UNIT #262		19427	SJ 32-8		32N08W17		1		17		579		66		242		47		26		0		169		121		1360
SAN JUAN 32-8 UNIT #264		11694	SJ 32-8		32N08W09		1		11		302		34		126		28		14		0		85		68		1397
SAN JUAN 32-8 UNIT #267A		10123	SJ 32-8		32N08W23		1		19		1,590		181		665		85		72		0		508		371		1345
SAN JUAN 32-8 UNIT #36		15041	SJ 32-8		32N08W25		1		17		222		25		93		35		10		0		48		32		371
SAN JUAN 32-9 UNIT #104		14466	SJ 32-9		32N10W24		1		16		1,241		32		119		15		13		0		91		69		426
SAN JUAN 32-9 UNIT #105		14467	SJ 32-9		31N09W08		1		15		545		14		52		10		6		0		37		28		427
SAN JUAN 32-9 UNIT #201		14438	SJ 32-9		31N09W02		1		7		146		4		14		4		2		0		9		7		441
SAN JUAN 32-9 UNIT #202		14439	SJ 32-9		31N09W02		1		12		497		13		48		8		5		0		34		27		442
SAN JUAN 32-9 UNIT #209		14273	SJ 32-9		31N10W02		1		8		89		2		9		4		1		0		4		3		443

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 25 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 32-9 UNIT #210		14274	SJ 32-9		31N10W02		1		16		262		25		91		28		10		0		53		38		444
SAN JUAN 32-9 UNIT #215		14468	SJ 32-9		32N09W10		1		14		842		22		81		12		9		0		60		47		503
SAN JUAN 32-9 UNIT #217		14275	SJ 32-9		32N09W16		1		14		1,046		27		100		13		11		0		76		59		482
SAN JUAN 32-9 UNIT #220		14000	SJ 32-9		31N10W11		1		26		3,126		82		300		34		33		0		233		157		594
SAN JUAN 32-9 UNIT #221		12458	SJ 32-9		31N10W11		1		3		25		1		2		1		0		0		1		1		595
SAN JUAN 32-9 UNIT #222		12556	SJ 32-9		31N10W12		1		0		0		0		0		0		0		0		0		0		596
SAN JUAN 32-9 UNIT #223		12459	SJ 32-9		31N10W12		1		6		74		2		7		3		1		0		4		3		597
SAN JUAN 32-9 UNIT #226		14469	SJ 32-9		32N09W32		1		13		641		17		62		10		7		0		45		36		445
SAN JUAN 32-9 UNIT #228		14440	SJ 32-9		32N09W36		1		21		2,028		53		195		23		21		0		150		108		446
SAN JUAN 32-9 UNIT #229		14267	SJ 32-9		32N10W36		1		18		1,461		38		140		18		15		0		107		79		447
SAN JUAN 32-9 UNIT #230		14470	SJ 32-9		32N10W36		1		12		194		5		19		6		2		0		11		8		448
SAN JUAN 32-9 UNIT #235		14450	SJ 32-9		32N09W36		1		11		580		15		56		9		6		0		41		33		449
SAN JUAN 32-9 UNIT #241		19430	SJ 32-9		32N09W13		1		13		494		13		47		9		5		0		34		26		1377
SAN JUAN 32-9 UNIT #242		766	SJ 32-9		32N09W14		1		5		182		5		18		3		2		0		12		11		1363
SAN JUAN 32-9 UNIT #250		14268	SJ 32-9		31N09W04		1		18		1,655		43		159		20		17		0		122		91		531
SAN JUAN 32-9 UNIT #251		14269	SJ 32-9		31N09W04		1		21		1,964		51		189		23		21		0		145		104		478
SAN JUAN 32-9 UNIT #252		14471	SJ 32-9		31N09W05		1		18		1,325		35		127		17		14		0		97		71		479
SAN JUAN 32-9 UNIT #253		14472	SJ 32-9		31N09W05		1		17		1,142		30		110		15		12		0		82		61		504
SAN JUAN 32-9 UNIT #254		14473	SJ 32-9		31N09W06		1		16		981		26		94		14		10		0		70		52		483
SAN JUAN 32-9 UNIT #255		14474	SJ 32-9		31N09W06		1		17		1,030		27		99		14		11		0		74		55		489
SAN JUAN 32-9 UNIT #257		14475	SJ 32-9		31N09W08		1		26		899		23		86		17		9		0		60		37		545
SAN JUAN 32-9 UNIT #258		14476	SJ 32-9		31N09W09		1		21		1,218		32		117		17		13		0		87		60		506
SAN JUAN 32-9 UNIT #259		14477	SJ 32-9		31N09W09		1		20		916		24		88		14		10		0		64		44		490
SAN JUAN 32-9 UNIT #260		14270	SJ 32-9		31N09W10		1		13		693		18		67		10		7		0		49		38		484
SAN JUAN 32-9 UNIT #261		14271	SJ 32-9		31N09W10		1		7		160		4		15		4		2		0		10		8		491
SAN JUAN 32-9 UNIT #262		14478	SJ 32-9		31N09W15		1		20		580		15		56		12		6		0		38		26		492
SAN JUAN 32-9 UNIT #263		14479	SJ 32-9		31N09W15		1		20		671		18		64		12		7		0		45		31		485
SAN JUAN 32-9 UNIT #264		14480	SJ 32-9		31N09W17		1		22		695		18		67		14		7		0		46		30		514
SAN JUAN 32-9 UNIT #268		14482	SJ 32-9		31N10W01		1		14		592		15		57		10		6		0		41		32		535
SAN JUAN 32-9 UNIT #269		14483	SJ 32-9		31N10W01		1		15		543		14		52		10		6		0		37		28		518
SAN JUAN 32-9 UNIT #270		14484	SJ 32-9		32N09W18		1		24		2,999		78		288		32		31		0		225		157		519
SAN JUAN 32-9 UNIT #271		14485	SJ 32-9		32N09W18		1		23		3,188		83		306		33		33		0		240		170		520
SAN JUAN 32-9 UNIT #272		5838	SJ 32-9		32N09W21		1		8		192		5		18		4		2		0		12		10		1366
SAN JUAN 32-9 UNIT #273		14486	SJ 32-9		32N09W19		1		9		850		22		82		10		9		0		63		53		521
SAN JUAN 32-9 UNIT #274		14272	SJ 32-9		32N09W28		1		25		2,175		57		209		26		23		0		160		109		575
SAN JUAN 32-9 UNIT #275		14487	SJ 32-9		32N09W29		1		14		739		19		71		11		8		0		52		41		536
SAN JUAN 32-9 UNIT #276		14344	SJ 32-9		32N09W27		1		17		1,211		32		116		16		13		0		88		66		579
SAN JUAN 32-9 UNIT #277		14488	SJ 32-9		32N09W30		1		21		1,774		46		170		22		19		0		130		92		516
SAN JUAN 32-9 UNIT #278		14489	SJ 32-9		32N09W31		1		18		1,239		32		119		16		13		0		90		65		515
SAN JUAN 32-9 UNIT #279		14490	SJ 32-9		32N09W31		1		18		1,286		34		124		17		13		0		94		69		528
SAN JUAN 32-9 UNIT #281		14491	SJ 32-9		32N09W32		1		21		1,207		31		116		17		13		0		86		60		470

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 26 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 32-9 UNIT #282		14345	SJ 32-9		32N09W33		1		20		1,393		36		134		18		15		0		101		72		522
SAN JUAN 32-9 UNIT #283		14346	SJ 32-9		32N09W33		1		22		2,004		52		192		24		21		0		148		103		480
SAN JUAN 32-9 UNIT #284		14492	SJ 32-9		32N10W13		1		16		1,701		44		163		19		18		0		126		97		523
SAN JUAN 32-9 UNIT #285		14493	SJ 32-9		32N10W13		1		15		1,424		37		137		16		15		0		105		83		537
SAN JUAN 32-9 UNIT #286		14494	SJ 32-9		32N10W14		1		19		2,231		58		214		24		23		0		167		123		493
SAN JUAN 32-9 UNIT #287		14495	SJ 32-9		32N10W14		1		16		1,628		42		156		19		17		0		121		93		533
SAN JUAN 32-9 UNIT #288		14496	SJ 32-9		32N10W23		1		12		1,077		28		103		13		11		0		79		64		534
SAN JUAN 32-9 UNIT #289		14497	SJ 32-9		32N10W23		1		21		2,283		60		219		26		24		0		170		121		524
SAN JUAN 32-9 UNIT #291		14498	SJ 32-9		32N10W24		1		16		1,211		32		116		15		13		0		88		66		505
SAN JUAN 32-9 UNIT #292		14499	SJ 32-9		32N10W25		1		22		2,059		54		198		24		22		0		152		106		525
SAN JUAN 32-9 UNIT #293		14500	SJ 32-9		32N10W25		1		14		1,265		33		121		15		13		0		93		73		494
SAN JUAN 32-9 UNIT #294		14501	SJ 32-9		32N10W26		1		18		1,150		30		110		16		12		0		83		61		529
SAN JUAN 32-9 UNIT #295		14502	SJ 32-9		32N10W26		1		18		1,254		33		120		16		13		0		91		67		526
SAN JUAN 32-9 UNIT #296		13928	SJ 32-9		32N10W35		1		10		375		10		36		6		4		0		26		21		560
SAN JUAN 32-9 UNIT #297		13929	SJ 32-9		32N10W35		1		6		146		4		14		3		2		0		9		8		527
SAN JUAN 32-9 UNIT #300		14503	SJ 32-9		32N10W11		1		15		1,512		39		145		17		16		0		112		87		507
SAN JUAN 32-9 UNIT #301		14504	SJ 32-9		32N10W12		1		26		2,688		70		258		30		28		0		200		135		508
SAN JUAN 32-9 UNIT #302		15548	SJ 32-9		32N09W09		1		19		1,405		37		135		18		15		0		102		74		658
SAN JUAN 32-9 UNIT #303 COM		12172	SJ 32-9		31N10W14		1		27		651		9		33		8		4		0		22		13		1261
SEYMOUR #720		14357	NON-UNIT		31N09W23		1		17		973		71		262		40		29		0		194		144		540
STATE GAS COM AA #1		14441	NON-UNIT		30N08W36		1		28		1,500		30		109		16		12		0		81		51		542
YAGER N COM #5		4873	NON-UNIT		31N07W03		1		8		114		2		9		3		1		0		5		4		450
TOTAL PROVED DEVELOPED: 320-Acre New Mexico							646				624,111		49,166		180,934		27,904		19,708		0		133,323		94,380
TOTAL PROVED DEVELOPED: NEW MEXICO							1052				910,164		74,402		273,803		41,343		29,823		0		202,637		147,402
PROVED UNDEVELOPED RESERVES
FC STATE COM #19A		10781	NON-UNIT		30N09W36		1		19		700		14		51		8		6		24		13		2		1346
FEDERAL G #4A COM		5796	SJ 32-7		31N07W10		1		23		1,900		81		296		37		32		56		171		76		1129
FRT 18-30N-7W (160-ACRE)		6048	NEBU		30N07W18		1		19		1,200		9		34		4		4		9		17		9		1062
FRT 26-32N-11W		10780	NON-UNIT		32N11W26		1		21		1,000		56		205		31		22		73		78		26		1204
GRASSY CANYON UNIT #3A		5809	SJ 32-7		32N07W31		1		25		2,700		177		653		76		71		87		419		211		1130
HEIZER #100S		5114	NON-UNIT		32N10W15		1		19		1,000		0		2		0		0		1		1		0		1005
NE BLANCO UNIT #404A		6026	NEBU		31N07W34		1		20		1,400		11		40		5		4		9		22		11		1060
NE BLANCO UNIT #414A		6023	NEBU		31N07W30		1		21		1,400		11		40		5		4		9		22		10		1054
NE BLANCO UNIT #417A		5274	NEBU		30N07W02		1		17		600		5		17		3		2		9		4		0		832
NE BLANCO UNIT #419A		6031	NEBU		30N07W03		1		18		900		7		26		4		3		9		10		4		824
NE BLANCO UNIT #420A		5279	NEBU		31N07W28		1		19		900		7		26		4		3		9		10		4		1065
NE BLANCO UNIT #421A		6033	NEBU		30N07W04		1		19		900		7		26		4		3		9		10		4		825
NE BLANCO UNIT #423A		6037	NEBU		30N07W08		1		18		800		6		23		3		2		9		8		3		827

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 27 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
NE BLANCO UNIT #424A		6034	NEBU		30N07W04		1		20		900		7		26		4		3		9		10		4		1035
NE BLANCO UNIT #427A		5148	NEBU		30N07W16		1		18		600		5		17		3		2		9		4		0		770
NE BLANCO UNIT #429A		5150	NEBU		30N07W17		1		17		700		5		20		3		2		9		6		1		771
NE BLANCO UNIT #431A		6046	NEBU		30N07W17		1		20		700		5		20		3		2		9		6		1		829
NE BLANCO UNIT #432A		5160	NEBU		30N07W07		1		19		900		7		26		4		3		9		10		4		1014
NE BLANCO UNIT #444A		6016	NEBU		31N07W23		1		20		1,100		9		31		4		3		9		15		7		1046
NE BLANCO UNIT #446A		6024	NEBU		31N07W33		1		20		1,200		9		34		4		4		9		17		8		1058
NE BLANCO UNIT #453A		6036	NEBU		30N07W06		1		18		1,200		9		34		4		4		9		17		9		1036
NE BLANCO UNIT #456A		6015	NEBU		31N07W26		1		17		800		6		23		3		2		9		8		3		1049
NE BLANCO UNIT #457		6022	NEBU		31N07W30		1		19		1,400		11		40		5		4		9		22		12		1066
NE BLANCO UNIT #457A		6014	NEBU		31N07W31		1		20		1,400		11		40		5		4		9		22		11		1055
NE BLANCO UNIT #459A		5800	NEBU		31N07W19		1		19		1,300		10		37		4		4		9		20		10		1043
NE BLANCO UNIT #467A		5269	NEBU		30N08W12		1		18		900		7		26		4		3		9		10		4		1061
NE BLANCO UNIT #469A		6007	NEBU		30N08W13		1		18		800		6		23		3		2		9		8		3		1040
NE BLANCO UNIT #470A		6021	NEBU		31N07W27		1		20		1,000		8		29		4		3		9		13		5		1050
NE BLANCO UNIT #472A		5803	NEBU		31N07W29		1		20		1,400		11		40		5		4		9		22		11		1052
NE BLANCO UNIT #473A		5281	NEBU		31N08W36		1		18		1,400		11		40		5		4		9		22		13		1067
NE BLANCO UNIT #475A		1787	NEBU		30N07W19		1		16		600		5		17		3		2		9		4		0		837
NE BLANCO UNIT #477S		1777	NEBU		30N07W29		1		17		700		5		20		3		2		9		6		1		1276
NE BLANCO UNIT #479A		1785	NEBU		30N07W20		1		16		600		5		17		3		2		9		4		0		839
NE BLANCO UNIT #488A		6019	NEBU		31N07W24		1		19		1,200		9		34		4		4		9		17		8		1047
NE BLANCO UNIT #489A		5792	NEBU		31N07W12		1		21		1,500		12		43		5		5		9		24		11		1039
NE BLANCO UNIT #494A		6020	NEBU		31N07W27		1		19		1,000		8		29		4		3		9		13		6		1051
NE BLANCO UNIT #505A		1784	NEBU		30N07W21		1		16		600		5		17		3		2		9		4		0		838
NORDHAUS #716S		5839	NON-UNIT		31N09W13		1		17		800		58		214		35		23		97		59		15		1131
SAN JUAN 28-6 UNIT #400S		6101	SJ 28-6		28N06W09		1		18		800		45		166		26		18		73		49		13		1343
SAN JUAN 28-6 UNIT #414S		6100	SJ 28-6		28N06W08		1		18		900		51		187		29		20		73		65		24		1342
SAN JUAN 29-5 UNIT #225A		5111	SJ 29-5		29N05W06		1		21		1,900		245		903		110		98		167		527		286		758
SAN JUAN 29-5 UNIT #231A		5416	SJ 29-5		29N05W05		1		19		1,500		223		822		107		90		195		431		245		1181
SAN JUAN 29-6 UNIT #206A		5409	SJ 29-6		29N06W04		1		19		900		118		434		67		47		167		152		54		904
SAN JUAN 29-6 UNIT #219A		6079	SJ 29-6		29N06W10		1		19		1,200		157		579		79		63		167		270		125		910
SAN JUAN 29-6 UNIT #222A		6083	SJ 29-6		29N06W12		1		23		2,000		262		965		114		105		167		578		278		914
SAN JUAN 29-6 UNIT #223A		6084	SJ 29-6		29N06W12		1		21		2,000		262		965		114		105		167		578		336		913
SAN JUAN 29-6 UNIT #224A		6085	SJ 29-6		29N06W13		1		21		1,000		131		482		72		53		167		190		65		916
SAN JUAN 29-6 UNIT #225A		6086	SJ 29-6		29N06W13		1		19		1,000		131		482		72		53		167		190		78		1337
SAN JUAN 29-6 UNIT #227A		6087	SJ 29-6		29N06W14		1		20		1,700		223		820		101		89		167		463		271		1338
SAN JUAN 29-6 UNIT #235A		5618	SJ 29-6		29N06W34		1		18		900		118		434		67		47		167		152		57		1297
SAN JUAN 29-6 UNIT #246A		5414	SJ 29-6		29N06W08		1		17		800		105		386		61		42		167		115		34		1294
SAN JUAN 29-6 UNIT #247A		6080	SJ 29-6		29N06W10		1		18		1,200		157		579		79		63		167		270		140		1336
SAN JUAN 29-6 UNIT #249A		6097	SJ 29-6		29N06W22		1		18		900		118		434		67		47		167		152		56		1340
SAN JUAN 29-6 UNIT #257A		5645	SJ 29-6		29N06W09		1		19		1,000		131		482		72		53		167		190		76		907

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 28 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 29-6 UNIT #258A		6089	SJ 29-6		29N06W16		1		18		800		105		386		61		42		167		115		30		920
SAN JUAN 29-6 UNIT #259A		5644	SJ 29-6		29N06W09		1		19		1,000		131		482		72		53		167		190		80		1301
SAN JUAN 29-6 UNIT #262A		6096	SJ 29-6		29N06W21		1		17		800		105		386		61		42		167		115		34		925
SAN JUAN 29-7 UNIT #538S		6075	SJ 29-7		29N07W26		1		17		800		94		348		54		38		147		109		34		1333
SAN JUAN 29-7 UNIT #544S		6053	SJ 29-7		29N07W04		1		17		700		83		304		50		33		147		74		11		884
SAN JUAN 29-7 UNIT #546S		6054	SJ 29-7		29N07W04		1		17		700		83		304		50		33		147		74		11		1324
SAN JUAN 29-7 UNIT #551S		6066	SJ 29-7		29N07W11		1		17		700		230		846		137		92		407		209		33		1330
SAN JUAN 29-7 UNIT #552S		6067	SJ 29-7		29N07W12		1		17		800		94		348		54		38		147		109		34		893
SAN JUAN 29-7 UNIT #553S		1546	SJ 29-7		29N07W14		1		17		800		94		348		54		38		147		109		34		901
SAN JUAN 29-7 UNIT #560S		6072	SJ 29-7		29N07W23		1		17		700		290		1,067		175		116		519		257		36		1331
SAN JUAN 29-7 UNIT #562S		6071	SJ 29-7		29N07W24		1		21		1,100		130		478		68		52		147		211		86		896
SAN JUAN 29-7 UNIT #580S		6052	SJ 29-7		29N07W01		1		19		700		83		304		50		33		147		74		9		881
SAN JUAN 30-5 UNIT #204A		5685	SJ 30-5		30N05W07		1		19		1,000		170		627		94		68		219		246		100		1303
SAN JUAN 30-5 UNIT #205A		5678	SJ 30-5		30N05W07		1		19		1,000		170		627		94		68		219		246		101		1302
SAN JUAN 30-5 UNIT #211A		5783	SJ 30-5		30N05W31		1		18		1,200		226		831		113		91		241		387		198		986
SAN JUAN 30-5 UNIT #224A		5719	SJ 30-5		30N05W17		1		19		900		169		623		96		68		241		218		71		966
SAN JUAN 30-5 UNIT #232A		5786	SJ 30-5		30N05W33		1		20		1,700		290		1,066		132		116		219		599		353		1307
SAN JUAN 30-5 UNIT #233A		5787	SJ 30-5		30N05W33		1		20		1,700		320		1,177		145		128		241		663		376		988
SAN JUAN 30-5 UNIT #235A		5743	SJ 30-5		30N05W27		1		18		900		153		565		88		61		219		196		73		1306
SAN JUAN 30-5 UNIT #236A		5742	SJ 30-5		30N05W27		1		18		900		153		565		88		61		219		196		71		1305
SAN JUAN 30-5 UNIT #246A		5741	SJ 30-5		30N05W26		1		18		800		150		554		88		60		241		165		44		978
SAN JUAN 30-5 UNIT #248A		11693	SJ 30-5		30N05W35		1		19		1,000		149		550		84		60		195		211		87		1347
SAN JUAN 30-5 UNIT #262A		5791	SJ 30-5		30N05W12		1		19		1,000		188		692		103		75		241		273		112		960
SAN JUAN 30-6 UNIT #406S		6043	SJ 30-6		30N07W15		1		18		600		30		110		19		12		64		15		-5		861
SAN JUAN 30-6 UNIT #407S		5527	SJ 30-6		30N06W16		1		15		600		30		110		19		12		64		15		-6		849
SAN JUAN 30-6 UNIT #416S		5519	SJ 30-6		30N07W24		1		15		600		30		110		19		12		64		15		-6		783
SAN JUAN 30-6 UNIT #417S		5429	SJ 30-6		30N07W25		1		17		800		40		147		23		16		64		43		13		762
SAN JUAN 30-6 UNIT #418S		5522	SJ 30-6		30N07W26		1		15		600		30		110		19		12		64		15		-6		784
SAN JUAN 30-6 UNIT #423S		1782	SJ 30-6		30N07W28		1		16		700		35		129		22		14		64		29		3		1280
SAN JUAN 30-6 UNIT #428S		1783	SJ 30-6		30N07W28		1		17		700		35		129		22		14		64		29		2		1281
SAN JUAN 30-6 UNIT #440S		5526	SJ 30-6		30N06W15		1		15		600		30		110		19		12		64		15		-6		847
SAN JUAN 30-6 UNIT #441S		5495	SJ 30-6		30N06W31		1		15		600		30		110		19		12		64		15		-6		792
SAN JUAN 30-6 UNIT #453S		5528	SJ 30-6		30N06W17		1		15		600		30		110		19		12		64		15		-6		851
SAN JUAN 30-6 UNIT #456S		5531	SJ 30-6		30N06W18		1		16		600		30		110		19		12		64		15		-6		852
SAN JUAN 30-6 UNIT #458S		5532	SJ 30-6		30N06W19		1		18		700		35		129		22		14		64		29		2		854
SAN JUAN 30-6 UNIT #459S		5533	SJ 30-6		30N06W20		1		17		800		40		147		23		16		64		43		12		855
SAN JUAN 30-6 UNIT #465S		5507	SJ 30-6		30N07W15		1		15		600		30		110		19		12		64		15		-6		802
SAN JUAN 30-6 UNIT #470S		5534	SJ 30-6		30N06W21		1		17		800		40		147		23		16		64		43		12		856
SAN JUAN 30-6 UNIT #472S		5536	SJ 30-6		30N06W22		1		18		800		40		147		23		16		64		43		12		857
SAN JUAN 30-6 UNIT #474S		5540	SJ 30-6		30N06W27		1		17		800		40		147		23		16		64		43		12		866
SAN JUAN 30-6 UNIT #480S		5543	SJ 30-6		30N06W30		1		18		700		35		129		22		14		64		29		2		862

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 29 of 30

WILLIAMS PRODUCTION CO.

FRUITLAND COAL RESERVES
UNDERLYING PROPERTIES/WILLIAMS COAL SEAM GAS ROYALTY TRUST
RESERVES AND ECONOMIC SUMMARY
PROVED RESERVES AS OF DECEMBER 31, 2006

																OPER.						BFIT NET
								LIFE		GROSS GAS		NET GAS		REVENUE TO		EXPENSE		ADV&SEV		CAPITAL		REVENUE		10% DISC
LEASE NAME	PROPID		UNIT	LOCATION		WELLS		YEARS		MMCF		MMCF		INT. M$		M$		TAXES M$		M$		M$		REVENUE M$		SEQ NUM
SAN JUAN 30-6 UNIT #492S		5538	SJ 30-6		30N06W26		1		18		600		30		110		19		12		64		15		-4		1296
SAN JUAN 30-6 UNIT #498S		1779	SJ 30-6		30N07W30		1		18		700		104		382		66		42		195		80		2		1278
SAN JUAN 30-6 UNIT #499S		1780	SJ 30-6		30N07W30		1		17		700		35		129		22		14		64		29		2		1279
SAN JUAN 30-6 UNIT #501SR		5496	SJ 30-6		30N06W32		1		18		800		40		147		23		16		64		43		11		815
SAN JUAN 31-6 UNIT #220A		1791	SJ 31-6		31N06W33		1		17		800		86		315		51		34		140		89		24		1285
SAN JUAN 31-6 UNIT #221A		1801	SJ 31-6		31N06W33		1		17		800		86		315		51		34		140		89		24		1286
SAN JUAN 31-6 UNIT #222A		1803	SJ 31-6		31N06W32		1		17		600		64		236		42		26		140		28		-13		1287
SAN JUAN 31-6 UNIT #224A		708	SJ 31-6		31N06W31		1		15		600		64		236		42		26		140		28		-15		1164
SAN JUAN 31-6 UNIT #225A		5611	SJ 31-6		31N06W31		1		16		600		64		236		42		26		140		28		-15		1163
SAN JUAN 31-6 UNIT #228A		1806	SJ 31-6		31N06W28		1		20		1,400		150		552		73		60		140		278		128		1289
SAN JUAN 31-6 UNIT #232A		6029	SJ 31-6		30N07W01		1		15		600		64		236		42		26		140		28		-16		934
SAN JUAN 31-6 UNIT #233A		1805	SJ 31-6		31N06W29		1		20		1,400		150		552		73		60		140		278		128		1288
SAN JUAN 32-9 UNIT #105S		5956	SJ 32-9		31N09W08		1		15		600		16		58		10		6		34		7		-3		1084
SAN JUAN 32-9 UNIT #209S		5862	SJ 32-9		31N10W02		1		19		600		16		58		10		6		34		7		-2		1316
SAN JUAN 32-9 UNIT #210S		5865	SJ 32-9		31N10W02		1		18		600		57		209		37		23		122		28		-8		1317
SAN JUAN 32-9 UNIT #220S		5897	SJ 32-9		31N10W11		1		20		1,000		26		96		14		10		34		37		14		1090
SAN JUAN 32-9 UNIT #221S		5890	SJ 32-9		31N10W11		1		19		1,000		26		96		14		10		34		37		15		1091
SAN JUAN 32-9 UNIT #242A		764	SJ 32-9		32N09W14		1		21		900		23		86		14		9		34		30		8		1442
SAN JUAN 32-9 UNIT #258S		5958	SJ 32-9		31N09W09		1		18		700		18		67		11		7		34		15		1		1086
SAN JUAN 32-9 UNIT #296S		5853	SJ 32-9		32N10W35		1		21		1,000		26		96		14		10		34		37		12		1123
YAGER N COM #5A		6009	SJ 32-7		31N07W03		1		22		2,000		42		153		19		17		27		91		49		1128
TOTAL PROVED UNDEVELOPED: 160-Acre New Mexico							116				111,676		8,570		31,539		4,618		3,435		11,155		12,331		5,022
FRT 18-30N-7W		6047	NEBU		30N07W18		1		20		1,200		9		34		4		4		9		17		8		1042
TOTAL PROVED UNDEVELOPED: 320-Acre New Mexico							1				1,200		9		34		4		4		9		17		8
TOTAL PROVED UNDEVELOPED: NEW MEXICO							117				112,876		8,580		31,574		4,622		3,439		11,164		12,349		5,030
TOTAL PROVED RESERVES: NEW MEXICO							1169				1,023,040		82,981		305,377		45,965		33,262		11,164		214,985		152,431
TOTAL PROVED RESERVES							1190				1,056,132		89,741		324,290		45,965		33,262		11,164		233,898		165,171

	TABLE 4
This page is a part of a Miller and Lents, Ltd. report and should not be used independently of the report.	Page 30 of 30