S.A. Nasim. Elements of ecology / S.A. Nasim. - New Delhi : Axis Books, 2012. - viii, 271 p. : ill. ; 24cm. Includes index. ISBN: 9789381302347 (hbk.) Subjects--Topical Terms: Environmental protection. LC Class. No.: Microfiche 2013/60008 (Q) Dewey Class. No.: 577 / NAS