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1. Condition map of Minnesota Trunk Highways: a 7,000 mile primary system showing national and state markings

1932. Minnesota. Department of Highways. Scale approximately 1:1,530,000. Description based on: 1932 sheet. Each sheet lists the Commissioner of highways and the Chief Engineer. On verso: ...

2. 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.

3. 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.