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Withgott/Brennan, Environment: The Science Behind the Stories AP* Edition 4th Edition ©2011 (PDF)
Withgott/Brennan, Environment: The Science Behind the Stories 2nd Edition ©2007
Wright/Nebel, Environmental Science: Toward a Sustainable Future 10th Edition ©2008
Wright/Nebel, Environmental Science: Toward a Sustainable Future 9th Edition ©2005
Wright/Nebel, Environmental Science: Toward a Sustainable Future 8th Edition ©2002