Asthana, D. K. Environment : problems & solutions / D. K. Asthana and Meera Asthana. - 2nd ed. - New Delhi : S. Chand Co., 2001. - xix, 434 p. : ill. ; 24 cm. ISBN: 8121916542 Subjects--Topical Terms: Environmental Science. Dewey Class. No.: 363.7 / ASE