Temporal Trends of Selected Agricultural Chemicals in Iowa's Groundwater, 1982-95: Are Things Getting Better?

Dana W. Kolpin, Debra Sneck-Fahrer, George R. Hallberg, and Robert D. Libra

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ACKNOWLEDGMENTS

The authors thank Dr. Roy F. Spalding of the Water Sciences Laboratory, University of Nebraska and George Groschen and Kyle Juracek of the U.S. Geological Survey for their critical review of this manuscript.

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