Construction of dams and aircraft overflights in national park units : hearing before the Subcommittee on National Parks and Recreation of the Committee on Interior and Insular Affairs, House of Representatives, ninety-ninth Congress, second session on H.R.4089, an act to prohibit the construction of dams within national parks and monuments, H.R.4430, to require the Secretary of the Interior to conduct a study to determine the appropriate minimum altitude for aircraft flying over national park system units, hearing held in Washington, D.C. May 20, 1986.
United States.Congress.House.Committee on Interior and Insular Affairs.Subcommittee on National Parks and Recreation.
Washington : U.S.G.P.O.,
1987.
Serial no. 99-59
Dams