Public Land Policy and Management Act of 1975 : hearings before the Subcommittee on Public Lands of the Committee on Interior and Insular Affairs, House of Representatives, Ninety-fourth Congress, first session on H.R. 5224 and H.R. 5622, to provide for the management, protection, and development of the national resource lands, and for other purposes : hearings held in Washington, D.C., March 21, 24, and 25; April 7 and 11, 1975