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  1. Clean air protection problems at 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 Third Congress, second session, April 29, 1994.
    By: United States.
    Publication info: Washington :For sale by the U.S. G.P.O., Supt. of Docs., Congressional Sales Office,1995.
    Contributed by: Boston Public Library (
    Subjects: Air  Air quality management  Environmental monitoring  National parks and reserves  Physiological effect  Pollution  Prevention  United States  Wilderness areas  
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