@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} }