Relation of Land Use to Nitrate in the Surficial Aquifer Along the Straight River, North-Central Minnesota, 1992-93 Image Date Issued 1996-03 Author Ruhl, J.F. Main Topic Water Quality & Pollutants Groundwater
Designation of Principal Water-Supply Aquifers in Minnesota Image Date Issued 1981 Author Adolphson, D.G. Ruhl, J.F. Wolf, R.J. Main Topic Water Use & Availability Groundwater
