United States. Congress. House. Committee on Government Operations. Environment, E. (1991). Problems with Clean Air Act protection for national parks and wilderness areas: hearing before the Environment, Energy, and Natural Resources Subcommittee of the Committee on Government Operations, House of Representatives, One Hundred First Congress, second session, March 9, 1990. Washington: U.S. G.P.O. .
MLA CitationUnited States. Congress. House. Committee on Government Operations. Environment, Energy, and Natural Resources Subcommittee. Problems With Clean Air Act Protection for National Parks And Wilderness Areas: Hearing Before the Environment, Energy, And Natural Resources Subcommittee of the Committee On Government Operations, House of Representatives, One Hundred First Congress, Second Session, March 9, 1990. Washington: U.S. G.P.O. , 1991.
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