Air quality issues affecting national parks, forests, and public lands joint oversight hearing before the Subcommittee on National Parks and Public Lands and the Subcommittee on General Oversight and California Desert Lands of the Committee on Interior and Insular Affairs, House of Representatives, One Hundred Second Congress, second session ... hearing held in Washington, DC, April 30, 1992.

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• Air quality issues affecting national parks, forests, and public lands joint oversight hearing before the Subcommittee on National Parks and Public Lands and the Subcommittee on General Oversight and California Desert Lands of the Committee on Interior and Insular Affairs, House of Representatives, One Hundred Second Congress, second session ... hearing held in Washington, DC, April 30, 1992.
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• Air quality issues affecting national parks, forests, and public lands : joint oversight hearing before the Subcommittee on National Parks and Public Lands and the Subcommittee on General Oversight and California Desert Lands of the Committee on Interior and Insular Affairs, House of Representatives, One Hundred Second Congress, second session ... hearing held in Washington, DC, April 30, 1992.
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