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C <br />EPA. 1976. "Quality Criteria for Water" <br />Hem, John D. 1989. "Study and Interpretation of the Chemical <br />Characteristics of Natural Water" USGS Water Supply Paper 2254, Third <br />Edition <br />National Academy of Sciences. 1974. Nutrients and Toxic Substances in <br />Water for Livestock and Poultry <br />(From website: extension.usu.edu/files/agpubs/beef28.pdf) <br />• <br />• <br />23 <br />