Chhatwal, G.R.. Environmental water pollution and its control / Edited by G.R. Chhatwal, M.C. Mehra, M. Satake, T. Katyal, Mohan Katyal, T. Nagahiro. - 1st ed / - New Delhi : Anmol Publications , 1989 - p532 : Subjects--Topical Terms: Water quality Dewey Class. No.: G:555(D854) / M9;1