Search Results for the EPA National Library Catalog

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Select Item	Title	Year Published
1	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
2	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

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