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3. American Public Health Association, 1989. Standard Methods for the Examination of Water and Wastewater. APHA, Washington, DC
4. American Public Health Association, 1998. Standard Methods for the Examination of Water and Wastewater. APHA, Washington, DC
5. The sealing of soils by manure. I. Preliminary investigations;Barrington;Can. Agric. Eng.,1987