Cal. Pub. Res. Code § 6442

Public lands of the State, situated within the exterior boundaries of a National park, which in the judgment of the commission are more valuable for timber or recreational uses than for any other purpose may be exchanged for timber lands or other public lands of the United States of equal value, in one or more compact tracts, situated in the State. The commission shall select the lands to be so exchanged and arrange with the proper officials of the United States for their exchange.