16 U.S.C. § 2503
Section, Pub. L. 95-625, title X, §1004, Nov. 10, 1978, 92 Stat. 3539; Pub. L. 103-322, title III, §315021502,, 108 Stat. 1888, provided definitions for this chapter. See section 200501 of Title 54, National Park Service and Related Programs.