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1. Geology of Minnesota: a centennial volume, Plate 1
1972. Sims, Paul K. and Morey, G.B. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Minnesota, scale 1:1,000.000.
2. Geology of Minnesota: a centennial volume, Plate 2
1972. Sims, Paul K. and Morey, G.B. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ...
3. Ross Ice Shelf: Antarctica
1972. Projection: Polar Stereographic Projection: Standard Parallel -71°; Series: USGS Sketch Maps.
4. Ross Island: Antarctica
1972. Projection: Lambert Conformal Conic Projection: Standard Parallels -76°40' and -79°20'; Series: USGS 1:250,000 Topographic Reconnaissance Series.