Nag, Prithvish. Geography and environment / edited by Prithvish Nag, V.K. Kumra and Jagadish Singh. - New Delhi : Concept Publishing , 1997. - 3v. : ills.,figs.,tables ; 23cm . ISBN: 8170226058 Rs.1800.00 Subjects--Index Terms: GEOGRAPHY Dewey Class. No.: 910 / NAG/G