. 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. Air -- Pollution Physiological effect United States; Air -- Pollution United States Prevention; Air quality management -- United States; Environmental monitoring -- United States; National parks and reserves -- United States; Wilderness areas -- United States. 184. Please note that these images are extracted from scanned
. 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. Air -- Pollution Physiological effect United States; Air -- Pollution United States Prevention; Air quality management -- United States; Environmental monitoring -- United States; National parks and reserves -- United States; Wilderness areas -- United States. 184. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Congress. House. Committee on Government Operations. Environment, Energy, and Natural Resources Subcommittee. Washington : U. S. G. P. O. : For sale by the U. S. G. P. O. , Supt. of Docs. , Congressional Sales Office
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