Hydrogeologic, Water-Quality, and Land-Use Data for the Reconnaissance of Herbicides and Nitrate in Near-Surface Aquifers of the MidContinental United States, 1991, Kolpin, D.W., Burkart, M.R., and Thurman, E.M., 1993 (OFR-93-114)

Hydrogeologic, Water-Quality, and Land-Use Data for the Reconnaissance of Herbicides and Nitrate in Near-Surface Aquifers of the MidContinental United States, 1991, Kolpin, D.W., Burkart, M.R., and Thurman, E.M., 1993 (OFR-93-114). This report presents data collected for this study during 1991 by the US Geological Survey. Wells were sampled twice, first in the spring, (March or April) and again in the summer (July or August) of 1991. Out of print, unbound copy available.