16 U.S.C. § 430a–2

The Secretary of the Interior is authorized to acquire lands and interests in lands within the revised boundary by purchase, donation, with donated funds, or by exchange, utilizing for such exchanges federally owned lands of approximately equal value excluded from the park pursuant to sections 430a–1 to 430a–3 of this title. Federally owned lands so excluded which the Secretary of the Interior determines are not needed for such exchanges shall be disposed of in accordance with the provisions of chapters 1 to 11 of title 40 and division C (except sections 3302, 3307(e), 3501(b), 3509, 3906, 4710, and 4711) of subtitle I of title 41.