TY - RPRT TI - A Mass-balance nitrate model for predicting the effects of land use on ground-water quality in municipal wellhead-protection areas AU - M. H. Frimpter AU - J.J. Donohue AU - M.V. Rapacz AU - H.G. Beye PY - 1990 DO - 10.3133/ofr88493 UR - https://pubs.usgs.gov/publication/ofr88493 ID - ofr88493 ER -