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The Impact of air pollution on national park units : a summary of hearings held by the House Subcommittee on National Parks and Recreation, May 20-21, 1985
- "The Impact of air pollution on national park units : a summary of hearings held by the House Subcommittee on National Parks and Recreation, May 20-21, 1985"@en
- "The impact of air pollution on national park units a summary of hearings held by the House Subcommittee on National Parks and Recreation, May 20-21, 1985, prepared at the request of the House Committee on Interior and Insular Affairs, Subcommittee on National Parks and Recreation"@en