In subsec. (a), “sections 100506(c) and 200306 of title 54” substituted for “section 6 of the Act of September 3, 1964 (78 Stat. 897, 903)” on authority of Pub. L. 113–287, § 6(e), Dec. 19, 2014, 128 Stat. 3272, which Act enacted Title 54, National Park Service and Related Programs. Section 6 of act Sept. 3, 1964, Pub. L. 88–578, had been renumbered section 7 by Pub. L. 92–347, § 2, July 11, 1972, 86 Stat. 459.