TY - RPRT TI - Agricultural chemicals in ground and surface water in a small watershed in Clayton County, Iowa, 1988-91 AU - S. J. Kalkhoff AU - B.D. Schaap PY - 1995 DO - 10.3133/wri954158 UR - https://pubs.usgs.gov/publication/wri954158 ID - wri954158 ER -