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An Appalachian Tragedy : Air Pollution and Tree Death in the Eastern Forests of North America. San Francisco, CA: Sierra Club Books, 1998.
Code Red: America's Five Most Polluted National Parks. Appalachian Voices, National Parks Conservation Association, Our Children's Earth Foundation, 2002.
Code Red! : America's Five Most Polluted National Parks. Appalachian Voices, 2004.