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14. Oversight on the National trails system act of 1968 : oversight hearings before the Subcommittee on National Parks and Recreation of the Committee on Interior and Insular Affairs, House of Representatives, Ninety-fourth Congress, second session ... held in Washington, D.C., March 11 and 12, 1976

15. Oversight on the National Trails System Act of 1968 : oversight hearings before the Subcommittee on National Parks and Recreation of the Committee on Interior and Insular Affairs, House of Representatives, Ninety-fourth Congress, second session on oversight on the National Trails System Act of 1968 and various proposals to study proposed additions to the National Scenic Trails System, hearings held in Washington, D.C., March 11 and 12, 1976