1873. Gamble, W. H. (William H.) (Draftsman and engraver). Atlas plate 81. Longitude west from Greenwich and Washington, D.C. 13.75 x 11.5 inches General Minnesota Maps. [S. Augustus Mitchell?]; Philadelphia?.
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1873. Gamble, W. H. (William H.) (Draftsman and engraver). Atlas plate 77. Date of copyright registration 1875. Longitude west from Greenwich and Washington, D.C. 14 x 12 inches General Minnesota Maps. [S. Augustus Mitchell?]; Philadelphia?.
1868. Gamble, W. H. (William H.) (Draftsman and engraver). Atlas plate 50. Longitude west from Greenwich and Washington, D.C. Map may have been published in 1868 or later. 14 x 12 inches General Minnesota Maps. [S. Augustus Mitchell, Jr.?]; Philadelphia.
234. Cram's new sectional map of the state of Minnesota : engraved from official draughts of each county.
1879. Cram, George Franklin, 1841-1928. Cartographic Details: Scale [1:633,600] (W 97°15'--W 89°29'/N 49°24'--N 43°30'). 94 x 81 centimeters 1:633,600 General Minnesota Maps. Geo. F. Cram; Chicago, Illinois 1872.
1877. Cram, George Franklin, 1841-1928. Cartographic Details: Scale [1:1,203,840]. 19 miles to an in.Covers northern Iowa, western Wisconsin, and central and southern Minnesota between Ca... Geo. F. Cram, proprietor of the Western Map Depot (Chicago, Ill.), 1876.
1877. Date of copyright registration 1876. 22 x 16 inches General Minnesota Maps. Geo. F. Cram; Chicago.
1917. George F. Cram Company. 128 x 101 centimeters Scale: [1:506,880]. 1 in. = 8 mi. General Minnesota Maps. G.F. Cram, (Chicago).
1964. Sloan, Robert E. (Robert Evan), 1929-. Map of Minnesota showing localities of Cretaceous rocks described in the RI-5 report, scale 1 inch = about 35 miles. Minnesota Geological Survey.
1964. Sloan, Robert E. (Robert Evan), 1929-. Contour map (lines of equal elevation) of the present altitude of the Pre-Cretaceous unconformity (erosional surface cut into older rocks) in Minne... Minnesota Geological Survey.
1969. Karklins, O.L. Interpretations of bedrock geology (distribution of rock at the land surface and beneath surface sediments) of the Precambrian rocks of the Granite... Minnesota Geological Survey.