EarthWorks Geospatial Catalog

Simple Bouguer gravity map of Minnesota, Two Harbors sheet [cartographic material] / by Rodney J. Ikola.

Relief shown by contours and spot heights. "Contour interval 50 feet." Gravity contour interval at 2 and 10 milligals. "Topographic base from U.S. Geological Survey 1:250,000 ..." "Compiled in 1967 and 1968." Includes location map.
Minnesota Geological Survey, University of Minnesota :
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