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77. A map of the surface formations of Minnesota

University of Minnesota Public content
Leverett, Frank,1859-1943. on 3 sheets 74 x 92 centimeters or smaller.|Scale 1:500,000|General Minnesota Maps. [Minnesota Geological Survey,], (Minneapolis).

78. A map of the United States.

University of Minnesota Public content
Relief shown pictorially. In lower right corner: "Ralph." Prime meridian: Philadelphia.|28 x 36 centimeters|Scale approximately 1:6,600,000|Gen...