P.R. Trivedi Environmental Biology - New Delhi Akashdeep Publishing House 1992 - 392p P.R. Trivedi & Gurudeep Raj: Environmental Biology. New Delhi. Akashdeep Publishing House, 1992. 81-7158-232-X--(574.5TRI) ENGLISH ISBN: 81-7158-232-X Dewey Class. No.: 574.5 / TRI