104 STAT. 274 PUBLIC LAW 101-313—JUNE 27, 1990 (2) to properly manage and interpret the monument in accordance with sections 102 and 105. (c)(1) The Secretary is authorized to exchange Federal lands within the area described on the map referred to in section 102(a) as the Piedras Marcadas Unit for lands owned by the city within the area described as the Atrisco Unit on such map. (2) The Secretary is authorized to exchange Federal lands within the area described on the map referred to in section 102(a) as the Boca Negra Unit for lands owned by the State within the area described as the Atrisco Unit on such map. (3) Exchanges shall be on the basis of equal value, and either party to the exchange may pay or accept cash in order to equalize the value of the properties exchanged. Gifts and (d) Prior to acquiring fee simple ownership of private lands or property. interests therein within the monument boundary, the Secretary is authorized to acquire an appropriate interest in such land by donation or for a nominal fee from the owner or owners of such lands for the purpose of providing immediate protection against trespass or vandalism or initiating any resource inventories necessary to carry out the purposes of this title. SEC. 104. EXPANSION OF THE MONUMENT. (a) Upon the execution of a binding agreement between the Secretary, the State, and the city that the lands identified in this subsection shall be perpetually managed in accordance with section 105, the Secretary shall include such lands, totaling approximately 1,994 acres, within the monument boundary. The lands referred to in this subsection are: (1) the approximately 1,779 acres generally known as the Piedras Marcadas Unit, as depicted on the map referred to in section 102(a); and (2) the approximately 215 acres generally known as the Boca Negra Unit, as depicted on the map referred to in section 102(a). (b)(1) The Secretary is authorized to acquire, as provided in section 103(a), some or all of the approximately 95 acres of land, or interests therein, within the area identified as "Potential Addition" on the map referred to in section 102(a), if, after consultation with the Petroglyph National Monument Advisory Commission established under section 110, the Secretary determines that such acquisition would further the purposes of this title. (2) The authority of the Secretary to make acquisitions pursuant to paragraph (1) shall expire on the date three years after the date of enactment of this Act. (3) Any lands acquired pursuant to paragraph (1) shall be incorporated into the monument and managed accordingly. SEC. 105. ADMINISTRATION AND MANAGEMENT OF THE MONUMENT. (a) The Secretary shall administer, manage, and protect the monument in accordance with the Act of August 25, 1916 (39 Stat. 535; 16 U.S.C. 1 et seq.), the Act of August 21, 1935 (49 Stat. 666; 16 U.S.C. 461 et seq.), and this title, and in such a manner as to preserve, for the benefit and enjoyment of present and future generations, its cultural and natural resources, and to provide for the interpretation of and research on such resources. (b) Units of the monument which may be added pursuant to section 104(a) shall be managed and developed in accordance with management and operational plans prepared concurrently with the
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