@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} }