1919. Clason Map Co. 66 x 48 centimeters Scale approximately 1:1,050,000. General Minnesota Maps. Clason Map Co., (Denver, Colo.).
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1920. Clason Map Co. Cartographic Details: Scale approximately 1:1,050,000 (W 97°00'--W 89°0'/N 49°00'--N 43°00'). "The green guide series"--Cover. Includes inset of "C... Clason Map Co.; Denver, Colorado 1920.
1970. Clason Map Co. Bounding Box (W,S,E,N): -93.9791,44.4981,-92.8021,45.361 Ecological Study for the Twin Cities Metropolitan Area. E.A. Hickock & Associates; Barr Engineering Co.