1969. Davidson, D.M., Jr. Map showing interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Perent Lake quadrang... Minnesota Geological Survey.
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1988. Jirsa, Mark A. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Sherry Lake quadrangle, scale 1:... Minnesota Geological Survey.
1803. Geologic map of the Silver Bay and Split Rock Point NE quadrangles, Lake County, Minnesota, M-65
1988. Miller, James D., Jr. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Silver Bay and Split Rock Point ... Minnesota Geological Survey.
1977. Morey, G.B. and Nathan, H.D. (Geologist). Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the South Lake quadrangle, scale 1:2... Minnesota Geological Survey.
1916. Smith, James Perrin, 1864-1931. Relief shown by hachures and spot heights.; Also shows oil fields. 146 x 119 centimeters on 2 sheets 79 x 124 centimeters Scale approximately 1:750... The Bureau (San Francisco), 1916.
1932. Grout, Frank F. (Frank Fitch), 1880-1958. Geologic map of Minnesota, scale 1:500,000, northern half of Minnesota. Minnesota Geological Survey.
1932. Grout, Frank F. (Frank Fitch), 1880-1958. Geologic map of Minnesota, scale 1:500,000, southern half of Minnesota. Minnesota Geological Survey.
1925. University of New Mexico. Black line copy. 85 x 77 centimeters Scale approximately 1:750,000; 1 inch = 12 miles. General Map Collection. The University (Albuquerque).
1910. Geological Survey (U.S.). Monograph LII Plate IV. 23 x 119 centimeters Scale 1:125,000 General Map Collection. A. Hoen & Co (Baltimore).
1973. Sims, Paul K. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the western Vermilion district, scal... Minnesota Geological Survey.