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 ... H.R. 4430 ... hearing held in Washington, DC, May 20, 1986

"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 ... H.R. 4430 ... hearing held in Washington, DC, May 20, 1986"@en
"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 ... H.R. 4430 ... hearing held in Washington, DC, May 20, 1986"@en