The MX missile system : oversight hearings before the Subcommittee on Public Lands and National Parks of the Committee on Interior and Insular Affairs, House of Representatives, Ninety-seventh Congress, first session, on the MX missile system and its possible impact on the public lands, their resources, and their management, hearings held in Washington, D.C., March 10, 12, 31, April 2, June 22, 1981.