Search Results for the EPA National Library Catalog

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Select Item Title Year Published
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory -- determination of the total phosphorus by a Kjeldahl digestion method and an automated colorimetric finish that includes dialysis 1992
Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory : determination of ammonium plus organic nitrogen by a Kjeldahl digestion method and an automated photometric finish that includes digest cleanup by gas diffusion / 2000
U.S. Geological Survey nutrient preservation experiment nutrient concentration data for surface-, ground-, and municipal-supply water samples and quality-assurance samples / 1995

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