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21. Reconnaissance geologic map of Pine Mountain quadrangle, Cook County, Minnesota, M-31

1977. Davidson, D.M., Jr. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Pine Mountain quadrangle, scale ...

22. Reconnaissance geologic map of Polly Lake quadrangle, Lake and Cook Counties, Minnesota, M-34

1977. Davidson, D.M., Jr. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Polly Lake quadrangle, scale 1:2...

23. Simple Bouguer gravity map of Minnesota, Duluth sheet, M-37

1977. Krenz, K.A. and Ervin, C.P. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ...

24. Simple Bouguer gravity map of Minnesota, Stillwater sheet, M-35

1977. McGinnis, L.D., Carlson, D.R., Pederson, R., and Schafersman, J.S. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ...