Exhibit 5



                                   OPINION OF
                            KUNZMAN & BOLLINGER, INC.
                              AS TO THE LEGALITY OF
                           THE UNITS REGISTERED HEREBY






                            KUNZMAN & BOLLINGER, INC.
                                ATTORNEYS-AT-LAW
                          5100 N. BROOKLINE, SUITE 600
                          OKLAHOMA CITY, OKLAHOMA 73112

                            Telephone (405) 942-3501
                               Fax (405) 942-3527



                                    May 27, 2003

Atlas Resources, Inc.
311 Rouser Road
Moon Township, Pennsylvania 15108

    RE:  ATLAS AMERICA PUBLIC #12-2003 PROGRAM

Gentlemen:

    You have requested our opinion on certain issues pertaining to Atlas America
Public #12-2003 Program (the "Program"), which is a series of up to four limited
partnerships to be formed under the Limited Partnership Laws of Delaware. Atlas
Resources, Inc., a Pennsylvania corporation, will be the Managing General
Partner of each Partnership.

Basis of Opinion

    Our opinion is based on our review of a certain Registration Statement on
Form S-1 and any amendments thereto, including any post-effective amendments,
for the Program (the "Registration Statement") as filed with the Securities and
Exchange Commission (the "Commission"), including the Prospectus and the Form of
Agreement of Limited Partnership for each Partnership (the "Partnership
Agreement"), the Subscription Agreements and the Drilling and Operating
Agreement contained therein, and on our review of such other documents and
records as we have deemed necessary to review for purposes of rendering our
opinion. As to various questions of fact material to our opinion which we have
not independently verified, we have relied on certain representations made to us
by officers and directors of the Managing General Partner.

    In rendering the opinion, herein provided, we have assumed each subscriber
has paid the consideration specified in the subscriber's Subscription Agreement
and the due execution and delivery of all relevant documents by all parties
thereto.

    As used in our opinion, the term "Units" includes the Limited Partner Units,
the Investor General Partner Units and the limited partner units into which the
Investor General Partner Units will be converted as described in the
Registration Statement.

Opinion

    Based upon the foregoing, we are of the opinion that:

               The Units when issued and sold in accordance with the
               Registration Statement as amended at the time it becomes
               effective with the Commission and the respective Partnership
               Agreement for the Partnership to which the respective Units
               relate, and upon the filing with the Delaware Secretary of State
               of such Partnership Agreement or an appropriate amendment or
               amendments to such Partnership Agreement, reflecting admission of
               the subscribers thereto as additional general partners and
               limited partners in accordance with Delaware law, the Units when
               issued against payment therefor as contemplated by the Prospectus
               and each respective Partnership Agreement will be validly issued
               and fully paid and nonassessable, except that the Managing
               General Partner may call for additional Capital






               Contributions from the Investor General Partners in a Partnership
               if necessary to pay that Partnership's obligations or
               liabilities:

                       o       which arose before the conversion of Investor
                               General Partners to Limited Partners, and for
                               which the Investor General Partners are liable
                               because of their status as general partners of
                               the Partnership at the time the obligations and
                               liabilities arose; and

                       o       which exceed the Partnership's assets, insurance
                               proceeds, and the Managing General Partner's
                               indemnification of the Investor General Partners
                               from any liability incurred in connection with
                               the Partnership which is in excess of the
                               Investor General Partners' interest in the
                               Partnership's undistributed net assets and
                               insurance proceeds.

    We hereby consent to the use of this opinion as an Exhibit to the
Registration Statement and to the reference to this firm in the Prospectus
included in the Registration Statement.


                                         Yours very truly,

                                         /s/ Kunzman & Bollinger, Inc.

                                         KUNZMAN & BOLLINGER, INC.