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1. Aerial gamma radiation in Minnesota and adjacent areas of North Dakota and South Dakota, M-83

1996. Lively, R.S. and Morey, G.B. Maps showing general Quaternary age surface geology of Minnesota and distribution of uranium, thorium and potassium-40 in surface sediments, scale ...

2. Geologic map of Minnesota, bedrock geology, S-20, (digital version 2)

1996. Morey, G.B. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Minnesota, scale 1:1,000,000, digita...