1959. Grout, Frank F. (Frank Fitch), 1880-1958, Schwartz, George M. (George Melvin), 1892-1980, and Sharp, R.P. (Surveyor). Plate 8, Geology map of Townships 61 and 62 North, Range 3 East, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Minnesota Geological Survey.
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1969. Griffin, William L. and Morey, G.B. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Isaac Lake Quadrangle, St. Louis... Minnesota Geological Survey.
1972. Morey, G.B. and Sims, Paul K. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Minnesota, scale 1:1,000.000. Minnesota Geological Survey.
1972. Morey, G.B. and Sims, Paul K. Bouguer gravity anomaly map (anomaly related to different densities of rocks in the upper crust, Bouguer anomaly is a corrected difference between ... Minnesota Geological Survey.
1939. Grout, Frank F. (Frank Fitch), 1880-1958 and Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Townships 54 and 55 North, Ranges 7 ... Minnesota Geological Survey.
1939. Grout, Frank F. (Frank Fitch), 1880-1958 and Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Townships 56 North, Range 7 West and... Minnesota Geological Survey.
1939. Grout, Frank F. (Frank Fitch), 1880-1958 and Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 57 North, Ranges 6 and 7 We... Minnesota Geological Survey.
1939. Grout, Frank F. (Frank Fitch), 1880-1958 and Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 58 North, Range 6 West and ... Minnesota Geological Survey.
1939. Grout, Frank F. (Frank Fitch), 1880-1958 and Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of a portion of Township 59 North, Rang... Minnesota Geological Survey.
1939. Grout, Frank F. (Frank Fitch), 1880-1958 and Schwartz, George M. (George Melvin), 1892-1980. Structural (recognizable features produced by deformation of rocks) map of anorthosite occurrence, scale 1 inch = about 2 miles. Minnesota Geological Survey.