Geologic map of Gabbro Lake quadrangle, Lake County, Minnesota [cartographic material] / by J.C. Green, W.C. Phinney, and P.W. Weiblen.
Relief shown by contours and spot heights. "Contour interval 20 feet." "Base from U.S. Geological Survey topographic map, 1957." "Geology mapped 1961-1965." Includes declination diagram, location map, and index to mapping.
- Minnesota Geological Survey, University of Minnesota
- Held by
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