1911. Hassan, A. F. each sheet 73 x 62 centimeters Scale 1:500,000 General Minnesota Maps. [The Survey], (Washington, D.C.).
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2. Minnesota
1917. Hassan, A. F. 67 x 60 centimeters Scale 1:1,000,000 General Minnesota Maps. The Survey, (Washington, D.C.).
1922. Hassan, A. F. Compiled in 1921 and 1922.; At head of title: U.S. Geological Survey. 157 x 107 centimeters Scale 1:500,000 General Map Collection. U.S. Geological Survey (Washington, D.C).
1921. Hassan, A. F. Reprinted 1941. 72 x 117 centimeters Scale 1:500,000 General Map Collection. U.S. Geological Survey (Washington).
1920. Hassan, A. F. Horizontal datum is North American.; "Compiled in 1920." 72 x 117 centimeters Scale 1:500,000 General Map Collection. Geological Survey (Washington, D.C).