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).
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).