Section, Pub. L. 88–578, title I, § 10, formerly § 9, as added Pub. L. 90–401, § 4, July 15, 1968, 82 Stat. 355; renumbered § 10, Pub. L. 92–347, § 2, July 11, 1972, 86 Stat. 459, related to contracts for options to acquire lands and waters in national park system. See section 200309 of Title 54, National Park Service and Related Programs.

A prior section 10 of Pub. L. 88–578 was renumbered section 11 and was classified to section 460l–10c of this title prior to repeal by Pub. L. 113–287.