To facilitate studies of the distribution of nitrate in ground water in the conterminous United States, a data base was constructed that comprises all nitrate concentration data for ground-water samples recorded by the U.S. Geological Survey (USGS). The data comprise 474,484 analyses from 146,751 wells and represent samples taken from 1889 through 1990. Description Site number. Pointer to NITRATE.PAT file. Location number. C00042 Source agency. C0001 Site identification
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Kenneth J. Lanfear (1992) studied this question.