1955. Grout, Frank F. (Frank Fitch), 1880-1958 and Wolff, J.F., Sr. Diagram showing correlation of subdivisions of Iron-Formations Cuyuna, Mesabi, and Gogebic Ranges, Minnesota, , vertical scale 1 inch = about 200 f... Minnesota Geological Survey.
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1964. Taylor, Richard B. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Duluth and vicinity, St. Louis Count... Minnesota Geological Survey.
1949. Schwartz, George M. (George Melvin), 1892-1980. Maps showing sequence of geologic units (beds) alongshore from Mesaba Avenue to Beyond Lakewood, scale 1 inch = about 1,800 feet. Minnesota Geological Survey.
1949. Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 49 North, Range 17 West, sc... Minnesota Geological Survey.
1949. Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Townships 49 and 50 North, Range 14 ... Minnesota Geological Survey.
1949. Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 50 North, Range 15 West, sc... Minnesota Geological Survey.
1949. Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 51 North, Range 13 West, sc... Minnesota Geological Survey.
1949. Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 51 North, Range 14 West, sc... Minnesota Geological Survey.
1949. Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 51 North, Range 15 West, sc... Minnesota Geological Survey.
1949. Schwartz, George M. (George Melvin), 1892-1980. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Township 52 North, Range 11 West, sc... Minnesota Geological Survey.