Simple Bouguer gravity map of Minnesota, Hibbing sheet [cartographic material] / by Rodney J. Ikola.
- Relief shown by contours and spot heights. "Contour interval 50 feet." Gravity contour intervals 2 milligal. "Base by U.S. Geological Survey, 1954." "Compiled in 1967." Includes index to mapping and location map.
- Minnesota Geological Survey, University of Minnesota :
- Held by
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