Organo-phosphorus pesticides in river and drinking water 1980 (tentative method) - London H.M.S.O. 1983 - 17 p. ill. 30cm - Methods for the examination of waters and associated materials . Subjects--Topical Terms: Pesticides--AnalysisWater--AnalysisOrganophosphorus compoundsWater--Pollution--Measurement Dewey Class. No.: 628.1 / 6842