Cunningham, William P. Principles of environmental science : inquiry & applications / by William Cunningham, Mary Ann Cunningham. - 4th ed. - New Delhi : McGraw-Hill, c2003. - xxii, 410 p. : col. ill., col. maps ; 28 cm. Includes index. ISBN: 9780070647725: Subjects--Topical Terms: Environmental sciences -- Textbooks Dewey Class. No.: 628 / CUN/P