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Senate Hearing, 93rd Congress - Grand Canyon National Park: hearing before the Subcommittee on Parks and Recreation of the Committee on Interior and Insular Affairs, United States Senate, Ninety-third Congress, first session, on S. 1296, a bill to further protect the outstanding scenic, natural, and scientific values of the Grand Canyon by enlarging the Grand Canyon National Park in the state of Arizona, and for other purposes, June 20, 1973.