@book {10564,
	title = {Code Red! : America{\textquoteright}s Five Most Polluted National Parks},
	year = {2004},
	pages = {21},
	publisher = {Appalachian Voices},
	organization = {Appalachian Voices},
	keywords = {Air pollution, Conservation},
	author = {Ayers, Harvard and Oakes, Joy}
}
@book {6075,
	title = {Code Red: America{\textquoteright}s Five Most Polluted National Parks},
	year = {2002},
	note = {32 page booklet includes information on the Smokies as one of the five most polluted national parks.  },
	publisher = {Appalachian Voices, National Parks Conservation Association, Our Children{\textquoteright}s Earth Foundation},
	organization = {Appalachian Voices, National Parks Conservation Association, Our Children{\textquoteright}s Earth Foundation},
	keywords = {Air pollution, Ozone, Pollution, Soils, Spruce-Fir forests},
	author = {Ayers, Harvard and Oakes, Joy}
}
@book {6928,
	title = {An Appalachian Tragedy : Air Pollution and Tree Death in the Eastern Forests of North America},
	year = {1998},
	note = {Illustrations, Maps},
	publisher = {Sierra Club Books},
	organization = {Sierra Club Books},
	address = {San Francisco, CA},
	keywords = {Air pollution, Forests, Photographs, Trees -- Growth decline},
	author = {Ayers, Harvard and Hager, Jenny and Little, Charles E}
}
