LAND ACQUISITION AUTHORITY.

SEC. 103. LAND ACQUISITION AUTHORITY. (a) The Secretary is authorized to acquire lands and interests therein within the monument boundary by donation, purchase with donated or appropriated funds, exchange, or transfer from any other Federal agency, except that lands or interests therein owned by the State or a political subdivision thereof may be acquired only by donation or exchange. (b) Where the surface and subsurface estates of private land to be acquired are separately owned, the Secretary shall acquire the subsurface estate to such land prior to or at the same time the surface estate is acquired: Provided, That this subsection shall not be applicable if the Secretary determines that the prior acquisition of the surface estate is necessary— (1) to prevent damage to the resources of the monument; or 104 STAT. 274 (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. (d) Prior to acquiring fee simple ownership of private lands or 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.