1919. Minnesota Geological Survey. Cartographic Details: Scale not given (W 94°25'00"--W 93°03'00"/N 47°53'00"--N 47°01'00"). "Plate IV" in upper right corner. [From Bulletin No. 16,... Minnesota Geological Survey (Minnesota), 1919.
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1915. Minnesota Geological Survey. Cartographic Details: Scale not given (W 95°36'00"--W 94°24'00"/N 48°59'00"--N 47°24'00"). Relief shown by contours. "Plate II" in upper right corn... The Survey (Minnesota), 1915.