1966. Green, John C., 1932-, Phinney, William C., and Weiblen, Paul W. Map showing interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Gabbro Lake 15 minut... Minnesota Geological Survey.
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1909. Allen, R. C. (Rolland Craten), 1881-1948. Relief shown by contours.; Geology by Geological Survey of Michigan. 70 x 44 centimeters Scale 1:45,000 General Map Collection. U.S. Geological Survey (Washington, D.C).
1920. Jillson, Willard Rouse, 1890-1975. Base computed and drafted in 1917 by Lucien M. Sellier.; Includes index of productive oil and gas fields, statistics for oil and coal production, a... The Survey (Frankfort, Ky).
1977. Ojakangas, Richard W. and Sims, Paul K. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Lost Lake quadrangle, scale 1:24... Minnesota Geological Survey.
1909. Van Hise, Charles Richard, 1857-1918. Relief shown by contours.; Includes 3 cross sections. 33 x 53 Centimeters Scale 1:62,500 General Map Collection. U.S. Geological Survey (Washington, D.C).
1970. 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.
1976. 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. Minnesota Geological Survey.
1993. Morey, G.B. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of Minnesota, scale 1:3,000,000. Minnesota Geological Survey.
1994. 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,, digit... Minnesota Geological Survey.
1996. 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, digita... Minnesota Geological Survey.