Water Quality in the Upper Mississippi River Basin, Minnesota, Wisconsin, South Dakota, Iowa, and North Dakota, 1995–98 By J.R. Stark, P.E. Hanson, R.M. Goldstein, J.D. Fallon, A.L. Fong, K.E. Lee, S.E. Kroening, and W.J. Andrews U.S. GEOLOGICAL SURVEY CIRCULAR 1211 The full report is available in pdf. Links to the pdf. A contribution of the National Water-Quality Assessment (NAWQA) Program
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