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1932
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1. Geologic map of the State of Minnesota, Plate 1
1932. Grout, Frank F. Geologic map of Minnesota, scale 1:500,000, northern half of Minnesota.
2. Geologic map of the State of Minnesota, Plate 2
1932. Grout, Frank F. Geologic map of Minnesota, scale 1:500,000, southern half of Minnesota.