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Senate Hearing, 92nd Congress - Boundary revision, National Park Service: hearing before the Subcommittee on Parks and Recreation of the Committee on Interior and Insular Affairs, United States Senate, Ninety-second Congress, first session, on S. 2601, S. 2650, bills to provide for increases in appropriation ceilings and boundary changes in certain units of the National Park system, and for other purposes [and] S. 1878, a bill to amend Section 5 of Public Law 89-664 which established the Bighorn Canyon National Recreation area, October 21, 1971.