Cunningham, William P. Environmental science : a global concern / - 4th ed. - Dubuque, IA : Wm. C. Brown Publishers, c1997. - xxi, 634 p. : ill. (some col.), col. maps ; 28 cm. Subjects--Topical Terms: Environmental sciences. Dewey Class. No.: 363 WCB 1997 C144 Or.