TY - RPRT TI - Nitrate and pesticides in surficial aquifers and trophic state and phosphorus sources for selected lakes, eastern Otter Tail County, west-central Minnesota, 1993-96 AU - J. F. Ruhl PY - 1997 DO - 10.3133/wri974085 UR - https://pubs.usgs.gov/publication/wri974085 ID - wri974085 ER -