Boerboom, Terrence J.Miller, James D., Jr.Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Silver Island Lake, Wilson Lake and Toohey Lake quadrangles, scale 1:24,000.PDFengMinnesota Geological SurveyPublicBedrock geologic map of the Silver Island Lake, Wilson Lake, and western Toohey Lake quadrangles, Lake and Cook Counties, Minnesota, M-81MapsMinnesota1994University of Minnesota