EXHIBIT 4(a) ------------ CERTIFICATE OF LIMITED PARTNERSHIP FOR ATLAS AMERICA PUBLIC #15-2005(A) L.P. DELWARE --------------------- PAGE 1 THE FIRST STATE I, HARRIET SMITH WINDSOR, SECRETARY OF STATE OF THE STATE OF DELAWARE, DO HEREBY CERTIFY THE ATTACHED IS A TRUE AND CORRECT COPY OF THE CERTIFICATE OF LIMITED PARTNERSHIP OF "ATLAS AMERICA PUBLIC #15-2005(A) L.P.", FILED IN THIS OFFICE ON THE TWENTY-FIFTH DAY OF JULY, A.D. 2005, AT 11 O'CLOCK A.M. HARRIET SMITH WINDSOR ------------------------------------------ [LOGO APPEARS HERE] HARRIET SMITH WINDSOR, SECRETARY OF STATE 4004945 8100 AUTHENTICATION: 4044304 050611356 DATE: 07-25-05 STATE OF DELAWARE SECRETARY OF STATE DIVISION OF CORPORATIONS DELIVERED 11:00 AM 07/25/2005 FILED 11:00 AM 07/25/2005 SRV 050611356 - 4004945 FILE STATE OF DELAWARE CERTIFICATE OF LIMITED PARTNERSHIP o THE UNDERSIGNED, desiring to form a limited partnership pursuant to the Delaware Revised Uniform Limited Partnership Act, 6 Delaware Code, Chapter 17, do hereby certify as follows: o FIRST: The name of the limited partnership is ATLAS AMERICA PUBLIC #15-2005(A) L.P. o SECOND: The address of its registered office in the State of Delaware is 110 S. POPLAR STREET, SUITE 101 in the city of WILMINGTON, DE 19801 The name of the Registered Agent at such address is ANDREW M. LUBIN o Third: The name and mailing address of each general partner is as follows: ATLAS RESOURCES, INC. MANAGING GENERAL PARTNER 311 ROUSER ROAD, P.O. BOX 611 MOON TOWNSHIP, PA 15108 o IN WITNESS WHEREOF, the undersigned has executed this Certificate of Limited Partnership of Atlas America Public #15-2005(A) L.P.as of July 22 2005 Partnership Name BY: ATLAS RESOURCES, INC MANAGING GENERAL PARTNER Karen A. Black -------------------------------------------- KAREN A. BLACK, VICE PRESIDENT - PARTNERSHIP ADMINISTRATION