1153 16 U.S.C. § 1241-51 (2012) (1983 Amendments, Pub. L. No. 98-11, 97 Stat. 42, 48, amended the National Trails System Act, Pub. L.No. 90-543, 82 Stat. 919 (1968)); see generally Preseault I, 494 U.S. at 5-8 (discussing Act and Amendments), 15-16 (distinguishing types of acquisitions).