1959. Grout, Frank F. (Frank Fitch), 1880-1958, Schwartz, George M. (George Melvin), 1892-1980, and Sharp, R.P. (Surveyor). Plate 4, Sequence of volcanic lava flows along shore from Good Harbor Bay to Grand Portage Bay, Minnesota, scale 1 inch = about 3/4 miles. Minnesota Geological Survey.
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1959. Grout, Frank F. (Frank Fitch), 1880-1958, Schwartz, George M. (George Melvin), 1892-1980, and Sharp, R.P. (Surveyor). Plate 5, Sequence of volcanic lava flows along shore from the Lake County line to Good Harbor Bay, Minnesota, scale 1 inch = about 3/4 miles. Minnesota Geological Survey.
1959. Grout, Frank F. (Frank Fitch), 1880-1958, Schwartz, George M. (George Melvin), 1892-1980, and Sharp, R.P. (Surveyor). Plate 6, Geology map of Township 64 North, Range 5 East, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Minnesota Geological Survey.
1959. Grout, Frank F. (Frank Fitch), 1880-1958, Schwartz, George M. (George Melvin), 1892-1980, and Sharp, R.P. (Surveyor). Plate 7, Geology map of Township 63 North, Range 5 East, Cook County, Minnesota, scale 1 inch = about 1/2 mile. Minnesota Geological Survey.
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.
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.