EXHIBIT 3.41

                                   BY-LAWS OF

                         PARTIN LIMESTONE PRODUCTS, INC.

                                    ARTICLE I
                              SHAREHOLDERS' MEETING

Section 1. PLACE OF MEETINGS.

     All meetings of the shareholders shall be held at the office of the
corporation in the State of California, as may be designated for that purpose
from time to time by the Board of Directors.

Section 2. ANNUAL MEETINGS.

     The annual meeting of the shareholders shall be held on the first Monday of
September     in each year, if not a legal holiday, and if a legal holiday, then
         ----
on the next succeeding business day, at the hour of 2:00 o'clock P.M., at which
time the shareholders shall elect by plurality vote a Board of Directors,
consider reports of the affairs of the Corporation, and transact such other
business as may properly be brought before the meeting.

Section 3. SPECIAL MEETINGS.

     Special meetings of the shareholders, for any purpose or purposes
whatsoever, may be called at any time by the President, or by the Board of
Directors, or by any two or more members thereof, or by one or more shareholders
holding not less than one-tenth (1/10) of the voting power of the corporation.

Section 4. NOTICE OF MEETINGS.

     Notices of meetings, annual or special, shall be given in writing to
shareholders entitled to vote by the Secretary or the Assistant Secretary, or if
there be no such officer, or in case of his neglect or refusal, by any director
or shareholder.

     Such notices shall be sent to the shareholder's address appearing on the
books of the corporation, or supplied by him to the corporation for the purpose
of notice, not less than seven days before such meeting.

     Notice of any meeting of shareholders shall specify the place, the day and
the hour of meeting, and in case of special meeting, as provided by the
Corporations Code of California, the general nature of the business to be
transacted.

     When a meeting is adjourned for thirty days or more, notice of the
adjourned meeting shall be given as in case of an original meeting. Save, as
aforesaid, it shall not be necessary to give any notice of the adjournment or of
the business to be transacted at an adjourned meeting other than by announcement
at the meeting at which such adjournment is taken.

Section 5. CONSENT TO SHAREHOLDERS' MEETINGS.

     The transactions of any meeting of shareholders, however called and
noticed, shall be valid as though had at a meeting duly held after regular call
and notice, if a quorum be present either in

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person or by proxy, and if, either before or after the meeting, each of the
shareholders entitled to vote, not present in person or by proxy, sign a written
waiver of notice, or a consent to the holding of such meeting, or an approval of
the minutes thereof. All such waivers, consents or approvals shall be filed with
the corporate records or made a part of the minutes of the meeting.

     Any action which may be taken at a meeting of the shareholders, may be
taken without a meeting if authorized by a writing signed by all of the holders
of shares who would be entitled to vote at a meeting for such purpose, and filed
with the Secretary of the corporation.

Section 6. QUORUM.

     The holders of a majority of the shares entitled to vote thereat, present
in person, or represented by proxy, shall be requisite and shall constitute a
quorum at all meetings of the shareholders for the transaction of business
except as otherwise provided by law, by the Articles of Incorporation, or by
these By-Laws. If, however, such majority shall not be present or represented at
any meeting of the shareholders, the shareholders entitled to vote thereat,
present in person, or by proxy, shall have power to adjourn the meeting from
time to time, until the requisite amount of voting shares shall be present. At
such adjourned meeting at which the requisite amount of voting shares shall be
represented, any business may be transacted which might have been transacted at
the meeting as originally notified.

Section 7. VOTING RIGHTS; CUMULATIVE VOTING.

     Only persons in whose names shares entitled to vote stand on the stock
records of the corporation on the day of any meeting of shareholders, unless
some other day be fixed by the Board of Directors for the determination of
shareholders of record, then on such other day, shall be entitled to vote at
such meeting.

     Every shareholder entitled to vote shall be entitled to one vote for each
of said shares and shall have the right to accumulate his votes as provided in
Section 2235, Corporations Code of California.

Section 8. PROXIES.

     Every shareholder entitled to vote, or to execute consents, may do so,
either in person or by written proxy, executed in accordance with the provisions
of Section 2225 of the Corporations Code of California and filed with the
Secretary of the corporation.

                                   ARTICLE II
                            DIRECTORS; MANAGEMENT

Section 1. POWERS.

     Subject to the limitation of the Articles of Incorporation, of the By-Laws
and of the Laws of the State of California as to action to be authorized or
approved by the shareholders, all corporate powers shall be exercised by or
under authority of, and the business and affairs of this corporation shall be
controlled by, a Board of Directors.

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Section 2. NUMBER AND QUALIFICATION.

     The authorized number of directors of the corporation shall be four ( 4 ),
until changed by amendment to the Articles of Incorporation or by an amendment
to this Section 2, Article II of these By-Laws, adopted by the vote or written
assent of the shareholders entitled to exercise the majority of the voting power
of the corporation.

Section 3. ELECTION AND TENURE OF OFFICE.

     The directors shall be elected by ballot at the annual meeting of the
shareholders, to serve for one year and until their successors are elected and
have qualified. Their term of office shall begin immediately after election.

Section 4. VACANCIES.

     Vacancies in the Board of Directors may be filled by a majority of the
remaining directors, though less than a quorum, or by a sole remaining director,
and each director so elected shall hold office until his successor is elected at
an annual meeting of shareholders or at a special meeting called for that
purpose.

     The shareholders may at any time elect a director to fill any vacancy not
filled by the directors, and may elect the additional directors at the meeting
at which an amendment of the By-Laws is voted authorizing an increase in the
number of directors.

     A vacancy or vacancies shall be deemed to exist in case of the death,
resignation or removal of any director, or if the shareholders shall increase
the authorized number of directors but shall fail at the meeting at which such
increase is authorized, or at an adjournment thereof, to elect the additional
director so provided for, or in case the shareholders fail at any time to elect
the full number of authorized directors.

     If the Board of Directors accepts the resignation of a Director tendered to
take effect at a future time, the Board, or the shareholders, shall have power
to elect a successor to take office when the resignation shall become effective.

     No reduction of the number of directors shall thrive the effect of removing
any director prior to the expiration of his term of office.

Section 5. REMOVAL OF DIRECTORS.

     The entire Board of Directors or any individual director may be removed
from office as provided by Section 810 of the Corporations Code of the State of
California.

Section 6. PLACE OF MEETINGS.

     Meetings of the Board of Directors shall be held at the office of the
corporation in the State of California, as designated for that purpose, from
time to time, by resolution of the Board of Directors or written consent of all
of the Members of the Board. Any meeting shall be valid, wherever held, if held
by the written consent of all Members of the Board of Directors, given either
before or after the meeting and filed with the Secretary of the corporation.

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Section 7. ORGANIZATION MEETINGS.

     The organization meetings of the Board of Directors shall be held
immediately following the adjournment of the annual meetings of the
shareholders.

Section 8. OTHER REGULAR MEETINGS.

     Regular meetings of the Board of Directors shall be held on first Monday in
September in each year at the hour of 3:00 P.M.

If said day shall fall upon a holiday, such meetings shall be held on the next
succeeding business day thereafter. No notice need be given of such regular
meetings.

Section 9. SPECIAL MEETINGS-NOTICES.

     Special meetings of the Board of Directors for any purpose or purposes
shall be called at any time by the President or if he is absent or unable or
refuses to act, by any Vice-President or by any two directors.

     Written notice of the time and place of special meetings shall be delivered
personally to the directors or sent to each director by letter or by telegram,
charges prepaid, addressed to him at his address as it is shown upon the records
of the corporation, or if it is not so shown on such records or is not readily
ascertainable, at the place in which the meetings of the directors are regularly
held. In case such notice is mailed or telegraphed, it shall be deposited in the
United States mail or delivered to the telegraph company in the place in which
the principal office of the corporation is located at least forty-eight (48)
hours prior to the time of the holding of the meeting. In case such notice is
delivered as above provided; it shall be so delivered at least twenty-four (24)
hours prior to the time of the holding of the meeting. Such mailing,
telegraphing or delivery as above provided shall be due, legal and personal
notice to such director.

Section 10. WAIVER OF NOTICE.

     When all of the directors are present at any directors' meeting, however
called or noticed, and sign a written consent thereto on the records of such
meeting, or, if a majority of the directors are present, and if those not
present sign in writing a waiver of notice of such meeting, whether prior to or
after the holding of such meeting, which said waiver shall be filed with the
Secretary of the corporation, the transactions thereof are as valid as if had at
a meeting regularly called and noticed.

Section 11. DIRECTORS ACTING WITHOUT A MEETING.

     Any action required or permitted to be taken by the Board of Directors, may
be taken without a meeting, and with the same force and effect as a unanimous
vote of directors, if all members of the board shall individually or
collectively consent in writing to such action.

Section 12. NOTICE OF ADJOURNMENT.

     Notice of the time and place of holding an adjourned meeting need not be
given to absent directors if the time and place be fixed at the meeting
adjourned.

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Section 13. QUORUM.

     A majority of the number of directors as fixed by the Articles or By-Laws
shall be necessary to constitute a quorum for the transaction of business, and
the action of a majority of the directors present at any meeting at which there
is a quorum, when duly assembled, is valid as a corporate act; provided that a
minority of the directors, in the absence of a quorum, may adjourn from time to
time, but may not transact any business.

                                   ARTICLE III
                                    OFFICERS

Section 1. OFFICERS.

     The officers of the corporation shall be a president, a vice-president, a
secretary, and a treasurer. The corporation may also have, at the discretion of
the board of directors, a chairman of the board-, one or more additional
vice-presidents, one or more assistant secretaries, one or more assistant
treasurers, and such other officer as may be appointed in accordance with the
provisions of Section 3 of this article. One person may hold two or more
offices, except those of president and secretary.

Section 2. ELECTION.

     The officers of the corporation, except such officers as may be appointed
in accordance with the provisions of Section 3 or Section 5 of this article
shall be chosen annually by the board of directors, and each shall hold his
office until he shall resign or shall be removed or otherwise disqualified to
serve, or his successor shall be elected and qualified.

Section 3. SUBORDINATE OFFICERS, ETC.

     The board of directors may appoint such other officers as the business of
the corporation may require, each of whom shall hold office for such period,
have such authority and perform such duties as are provided in the by-laws or as
the board of directors may from time to time determine.

Section 4. REMOVAL AND RESIGNATION.

     Any officer may be removed, either with or without cause, by a majority of
the directors at the time in office, at any regular or special meeting of the
board, or, except in case of an officer chosen by the board of directors, by any
officer upon whom such power of removal may be conferred by the board of
directors.

     Any officer may resign at any time by giving written notice to the board of
directors or to the president, or to the secretary of the corporation. Any such
resignation shall take effect at the date of the receipt of such notice or at
any later time specified therein; and, unless otherwise specified therein, the
acceptance of such resignation shall not be necessary to make it effective.

Section 5. VACANCIES.

     A vacancy in any office because of death, resignation, removal,
disqualification or any other cause shall be filled in the manner prescribed in
the by-laws for regular appointments to such office.

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Section 6. CHAIRMAN OF THE BOARD.

     The chairman of the board, if there shall be such an officer, shall, if
present, preside at all meetings of the board of directors, and exercise and
perform such other powers and duties as may be from time to time assigned to him
by the board of directors or prescribed by the by-laws.

Section 7. PRESIDENT.

     Subject to such supervisory powers, if any, as may be given by the board of
directors to the chairman of the board, if there be such an officer, the
president shall be the chief executive officer of the corporation and shall,
subject to the control of the board of directors, have general supervision,
direction and control of the business and officers of the corporation. He shall
preside at all meetings of the shareholders and in the absence of the chairman
of the board, or if there be none, at all meetings of the board of directors. He
shall be ex-officio a member of all the standing committees, including the
executive committee, if any, and shall have the general powers and duties of
management usually vested in the office of president of a corporation, and shall
have such other powers and duties as may be prescribed by the board of directors
or the by-laws.

Section 8. VICE PRESIDENT.

     In the absence or disability of the president, the vice presidents in order
of their rank as fixed by the board of directors, or if not ranked, the vice
president designated by the board of directors, shall perform all the duties of
the president, and when so acting shall have all the powers of, and be subject
to, all the restrictions upon, the president. The vice presidents shall have
such other powers and perform such other duties as from time to time may be
prescribed for them respectively by the board of directors or the by-laws.

Section 9. SECRETARY.

     The secretary shall keep, or cause to be kept, a book of minutes at the
principal office or such other place as the board of directors may order, of all
meetings of directors and shareholders, with the time and place of holding,
whether regular or special, and if special, how authorized, the notice thereof
given, the names of those present at directors' meetings, the number of shares
present or represented at shareholders' meetings and the proceedings thereof.

     The secretary shall keep, or cause to be kept, at the principal office or
at the office of the corporation's transfer agent, a share register, or
duplicate share register, showing the names of the shareholders and their
addresses; the number and classes of shares held by each; the number and date of
certificates issued for the same; and the number and date of cancellation of
every certificate surrendered for cancellation.

     The secretary shall give, or cause to be given, notice of all the meetings
of the shareholders and of the board of directors required by the by-laws or by
law to be given, and he shall keep the seal of the corporation in safe custody,
and shall have such other powers

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and perform such other duties as may be prescribed by the board of directors or
the by-laws.

Section 10. TREASURER.

     The treasurer shall keep and maintain, or cause to be kept and maintained,
adequate and correct accounts of the properties and business transactions of the
corporation, including accounts of its assets, liabilities, receipts,
disbursements, gains, losses, capital, surplus and shares. Any surplus,
including earned surplus, paid-in-surplus and surplus arising from a reduction
of stated capital, shall be classified according to source and shown in a
separate account. The books of account shall at all reasonable times be open to
inspection by any director.

     The treasurer shall deposit all moneys and other valuables in the name and
to the credit of the corporation with such depositaries as may be designated by
the board of directors. He shall disburse the funds-of the corporation as may be
ordered by the board of directors, shall render to the president and directors,
whenever they request it, an account of all of his transactions as treasurer and
of the financial condition of the corporation, and shall have such other powers
and perform such other duties as may be prescribed by the board of directors or
the by-laws.

                                   ARTICLE IV
                         EXECUTIVE AND OTHER COMMITTEES

     The Board of Directors may appoint an executive committee, and such other
committees as may be necessary from time to time, consisting of such number of
its members and with such powers as it may designate, consistent with the
Articles of Incorporation and By-Laws and the General Corporation Laws of the
State of California. Such committees shall hold office at the pleasure of the
board.

                                    ARTICLE V
                    CORPORATE RECORDS AND REPORTS--INSPECTION

Section 1. RECORDS.

     The corporation shall maintain adequate and correct accounts, books and
records of its business and properties. All of such books, records and accounts
shall be kept at its principal place of business in the State of California, as
fixed by the Board of Directors from time to time.

Section 2. INSPECTION OF BOOKS AND RECORDS.

     All books and records provided for in Section 3003 of the Corporations
Code of California shall be open to inspection of the directors and shareholders
from time to time and in the manner provided in said Section 3003.

Section 3. CERTIFICATION AND INSPECTION OF BY-LAWS.

     The original or a copy of these By-Laws, as amended or otherwise altered to
date, certified by the Secretary, shall be open to

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inspection by the shareholders of the company, as provided in Section 502 of the
Corporations Code of California.

Section 4. CHECKS, DRAFTS, ETC.

     All checks, drafts or other orders for payment of money, notes or other
evidences of indebtedness, issued in the name of or payable to the corporation,
shall be signed or endorsed by such person or persons and in such manner as
shall be determined from time to time by resolution of the Board of Directors.

Section 5. CONTRACTS, ETC.--HOW EXECUTED.

     The Board of Directors, except as in the By-Laws otherwise provided, may
authorize any officer or officers, agent or agents, to enter into any contract
or execute any instrument in the name of and on behalf of the corporation. Such
authority may be general or confined to specific instances. Unless so authorized
by the Board of Directors, no officer, agent or employee shall have any power or
authority to bind the corporation by any contract or engagement, or to pledge
its credit, or to render it liable for any purpose or to any amount.

Section 6. ANNUAL REPORT.

     The Board of Directors shall cause an annual report or statement to be sent
to the shareholders of this corporation not later than 120 days after the close
of the fiscal or calendar year in accordance with the provisions of Sections
3006 - 3010 of the Corporations Code of the State of California.

                                   ARTICLE VI
                       CERTIFICATES AND TRANSFER OF SHARES

Section 1. CERTIFICATES FOR SHARES.

     Certificates for shares shall be of such form and device as the Board of
Directors may designate and shall state the name of the record holder of the
shares represented thereby; its number; date of issuance; the number of shares
for which it is issued; the par value, if any, or a statement that such shares
are without par value; a statement of the rights, privileges, preferences and
restrictions, if any; a statement as to the redemption or conversion, if any; a
statement of liens or restrictions upon transfer or voting, if any; if the
shares be assessable or, if assessments are collectible by personal action, a
plain statement of such facts.

     Every certificate for shares must be signed by the President or a
Vice-President and the Secretary or an Assistant Secretary or must be
authenticated by facsimiles of the signatures of the President and Secretary or
by a facsimile of the signature of its President and the written signature of
its Secretary or an Assistant Secretary. Before it becomes effective every
certificate for shares authenticated by a facsimile of a signature must be
countersigned by a transfer agent or transfer clerk and must be registered by an

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incorporated bank or trust company, either domestic or foreign, as registrar of
transfers.

Section 2. TRANSFER ON THE BOOKS.

     Upon surrender to the Secretary or transfer agent of the corporation of a
certificate for shares duly endorsed or accompanied by proper evidence of
succession, assignment or authority to transfer, it shall be the duty of the
corporation to issue a new certificate to the person entitled thereto, cancel
the old certificate and record the transaction upon its books.

Section 3. LOST OR DESTROYED CERTIFICATES.

     Any person claiming a certificate of stock to be lost or destroyed shall
make an affidavit or affirmation of that fact and advertise the same in such
manner as the Board of Directors may require, and shall if the directors so
require give the corporation a bond of indemnity, in form and with one or more
sureties satisfactory to the Board, in at least double the value of the stock
represented by said certificate, whereupon a new certificate may be issued of
the same tenor and for the same number of shares as the one alleged to be lost
or destroyed.

Section 4. TRANSFER AGENTS AND REGISTRARS.

     The Board of Directors may appoint one or more transfer agents or transfer
clerks, and one or more registrars, which shall be an incorporated bank or trust
company--either domestic or foreign, who shall be appointed at such times and
places as the requirements of the corporation may necessitate and the Board of
Directors may designate.

Section 5. CLOSING STOCK TRANSFER BOOKS.

     The Board of Directors may close the transfer books in their discretion for
a period not exceeding thirty days preceding any meeting, annual or special, of
the shareholders, or the day appointed for the payment of a dividend.

                                   ARTICLE VII
                                 CORPORATE SEAL

     The corporate seal shall be circular in form, and shall have inscribed
thereon the name of the corporation, the date of its incorporation, and the word
California.

                                  ARTICLE VIII
                             AMENDMENTS TO BY-LAWS

Section 1. BY SHAREHOLDERS.

     New By-Laws may be adopted or these By-Laws may be repealed or amended at
their annual meeting, or at any other meeting of the shareholders called for
that purpose, by a vote of shareholders entitled to exercise a majority of the
voting power of the corporation, or by written assent of such shareholders.

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Section 2. POWERS OF DIRECTORS.

     Subject to the right of the shareholders to adopt, amend or repeal By-Laws,
as provided in Section 1 of this Article VIII the Board of Directors may adopt,
amend or repeal any of these By-Laws other than a By-Law or amendment thereof
changing the authorized number of directors.

Section 3. RECORD OF AMENDMENTS.

     Whenever an amendment or new By-Law is adopted, it shall be copied in the
Book of By-Laws with the original By-Laws, in the appropriate place. If any
By-Law is repealed, the fact of repeal with the date of the meeting at which the
repeal was enacted or written assent was filed shall be stated in said book.

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     KNOW ALL MEN BY THESE PRESENTS:

     That we, the undersigned, being all of the persons appointed in the
     Articles of Incorporation to act as the first Board of Directors of hereby
     assent to the foregoing By-Laws, and adopt the same as the By-Laws of said
     corporation.

     IN WITNESS WHEREOF, we have hereunto set our hands this 2nd day of January
     1964.


     /s/ Carl Partin
     -----------------------------   )
     Carl Partin                     )
                                     )
                                     )
     /s/ Garold Partin               )
     -----------------------------   }
     Garold Partin                   )
                                     )
                                     )
     /s/ Lelia Partin                )
     -----------------------------   )   Directors.
     Lelia Partin                    )
                                     )
                                     )
     /s/ George R. Hendricks         )
     -----------------------------   )
     George R. Hendricks             )
                                     )
                                     )

THIS IS TO CERTIFY:

     That I am the duly elected, qualified and acting Secretary of PARTIN
LIMESTONE PRODUCTS, INC. and that the above and foregoing By-Laws were adopted
as the By-Laws of said corporation on the 2nd day of January 1964, by the
persons appointed in the Articles of Incorporation to act as the first directors
of said corporation.

     IN WITNESS WHEREOF, I have hereunto set my hand this 2nd day of January
1964.


                                                   /s/ Illegible
                                                   -----------------------------
                                                       Secretary.