1. APHA, Standard methods for the examination of water and wastewater, 13th ed., Apha, 1971.
2. BOSCHETTI, M.M. and MCLOUGHLIN, T.F., Sanitalk,5(4), 14 (1957).
3. CARO, J.H. and TAYLOR, A.W., J. Agr. Food Chem.,19(2), 379 (1971).
4. CLEMENS, H.P. and SNEED, K.E., Lethal doses of several commercial chemicals for fingerling channel catfish. (Special Scientific Rept.--Fisheries No. 316). Washington:U.S. Fish & Wildlife Service, 1959.
5. COLE, A.E., A Symposium of Hydrobiology, 241 (1941).