Wild and free-roaming horses and burros act amendments : hearings before the Subcommittee on Public Lands of the Committee on Interior and Insular Affairs, House of Representatives, Ninety-fourth Congress, first and second sessions on H.R. 2935, H.R. 4470, H.R. 4577, and H.R. 6793, to amend the Federal law relating to the protection, management, and control of wild free-roaming horses and burros on public lands, hearings held in Billings, Montana, August 12, 1975, Washington, D.C., January 26, 1976. (U.S. Govt. Print. Off,, 1976)