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Citation: Bt. Nolan et al., RISK OF NITRATE IN GROUNDWATERS OF THE UNITED-STATES - A NATIONAL PERSPECTIVE, Environmental science & technology, 31(8), 1997, pp. 2229-2236

Authors: HELSEL DR GERBER DT ENGEL S

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Authors: HAMILTON PA HELSEL DR

Citation: Pa. Hamilton et Dr. Helsel, EFFECTS OF AGRICULTURE ON GROUNDWATER QUALITY IN 5 REGIONS OF THE UNITED-STATES, Ground water, 33(2), 1995, pp. 217-226

Authors: SCHULZE PA CAPEL PD SQUILLACE PJ HELSEL DR

Citation: Pa. Schulze et al., A LABORATORY AND FIELD-EVALUATION OF A PORTABLE IMMUNOASSAY TEST FOR TRIAZINE HERBICIDES IN ENVIRONMENTAL WATER SAMPLES, International journal of environmental analytical chemistry, 53(4), 1993, pp. 307-319