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Canada. Environment Canada -CA, Sampling for water quality. Ottawa, Ont, Canada: Environment Canada, 1983, p. xi, 55 p.: fig., tab.
American Water Works Association -Denver, CO, US, AWWA, Water quality and treatment : a handbook of public water supplies, 3rd ed.e ed. New York, NY, USA: McGraw-Hill, 1971, p. xii, 654 p.: fig., tab.