Edmondson, W.T.. Freshwater biology / by W.T. Edmonson. - 2nd ed. / . - New Delhi : International Book Distributors , 1992. - xx,1248p. : ills.,figs. ; 23cm. CD . NULL ISBN: NULL (Hb) Subjects--Index Terms: FRESH WATER BIOLOGY Dewey Class. No.: 578.76 / EDM/F