Effect of snowmelt on the quality of Filson Creek and Omaday Lake, Northeastern Minnesota / by D.I. Siegel ; with a section on preliminary evaluation of methods for determination of sulfate concentration in precipitation and other dilute solutions / by D.I. Siegel, L.E. Anderson, and J.A. Rogalla ; prepared in cooperation with the U.S. Environmental Protection Agency (Water-resources investigations ; 81-66)
Effect of snowmelt on the quality of Filson Creek and Omaday Lake, Northeastern Minnesota / by D.I. Siegel ; with a section on preliminary evaluation of methods for determination of sulfate concentration in precipitation and other dilute solutions / by D.I. Siegel, L.E. Anderson, and J.A. Rogalla ; prepared in cooperation with the U.S. Environmental Protection Agency