Ayers, Harvard, and Joy Oakes. Code Red! : America's Five Most Polluted National Parks. Appalachian Voices, 2004.

Ayers, Harvard, and Joy Oakes. Code Red: America's Five Most Polluted National Parks. Appalachian Voices, National Parks Conservation Association, Our Children's Earth Foundation, 2002.

Ayers, Harvard, Jenny Hager, and Charles E. Little. An Appalachian Tragedy : Air Pollution and Tree Death in the Eastern Forests of North America. San Francisco, CA: Sierra Club Books, 1998.