Hydrology and water quality of the copper-nickel study region, northeastern Minnesota / by Donald I. Siegel and Donald W. Ericson ; prepared in cooperation with Minnesota Environmental Quality Board, Copper-Nickel Study Staff. (Water-resources investigations ; 80-739) (Open-file report)
Hydrology and water quality of the copper-nickel study region, northeastern Minnesota / by Donald I. Siegel and Donald W. Ericson ; prepared in cooperation with Minnesota Environmental Quality Board, Copper-Nickel Study Staff.