Swarup, R., Mishra, S.N. and Jauhari, V.P. Encyclopaedia of ecology , environment and pollution control an introduction to man and his environment - New Delhi Mittal publications 1992 - 416p. V.1 ISBN: 817099361X 495 Subjects--Topical Terms: Ecology & environment-encyclopaediaEncyclopaedia Dewey Class. No.: 577.03 / SWA