Summary of pesticide data from streams and wells in the Potomac River Basin, 1993-96 [microform] / by Colleen A. Donnelly and Matthew J. Ferrari (USGS open-file report ; 97-666)
Summary of pesticide data from streams and wells in the Potomac River Basin, 1993-96 [microform] / by Colleen A. Donnelly and Matthew J. Ferrari