Principles of environmental science : inquiry & applications / William Cunningham, Mary Ann Cunningham. Cunningham, William. Cunningham, Mary Ann. Environmental sciences Textbooks. GE105 .C865 2011 363.7 22 CUP Includes index. New York : McGraw-Hill, c2011. c2011. 2011 Text xxiv, 389 p., [33] p. : g