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41. Geology of the Minneapolis-St. Paul metropolitan area, Bulletin 27, Plate 5
1936. Schwartz, George M. Structural Contour (contour lines of equal elevation that map features in the subsurface produced by rock deformation or erosion), map of the Minne...
42. Geology of the Minneapolis-St. Paul metropolitan area, Bulletin 27, Plate 6
1936. Schwartz, George M. Map of Minneapolis showing the rock surface topography (elevation of the bedrock surface), scale 1 inch = about 2,250 feet.
43. Geology of the Minneapolis-St. Paul metropolitan area, Bulletin 27, Plate 7
1936. Schwartz, George M. Map of Saint Paul showing the rock surface topography, (elevation of the bedrock surface), scale 1 inch = about 2,500 feet.
44. Map of mineral resources of Minnesota, 1954
1954. Schwartz, George M. and Prokopovich, N. Mineral resources map of Minnesota, scale 1:1,000,000.
45. Map of mineral resources of Minnesota, 1956
1956. Schwartz, George M. and Prokopovich, N. Mineral resources map of Minnesota, scale 1:1,000,000.
46. Map of mineral resources of Minnesota, 1966 (revised from 1956 edition)
1966. Schwartz, George M. and Prokopovich, N. Mineral resources map of Minnesota, scale 1:1,000,000.