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
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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