Rao, K.S. . Freash Water Ecology / Textual Documents K.S. Rao. - 1st ed. / - New Delhi : Anmol Publications , C 1992. - 308p. : ill. ; 22cm . ISBN: 81-7041-627-2 Rs. 350.00 Subjects--Index Terms: Zoology Freash water ecology PG-Zoology Dewey Class. No.: 591.5 / Ra 18 Fr