a study of interrelationships Enger, Eldon D. creator Smith, Bradley Fraser. text Boston, Mass WCB/McGraw Hill c1998 6th ed. / monographic xxi, 456 p. : ill. (some col.), col. maps ; 29 cm. 0 0 0 363_700000000000000_SMI Environmental sciences 363.7 SMI 069728655X (case) 0697286568 (pbk.)