1922. Geological Survey (U.S.). Compiled in 1921 and 1922. 112 x 69 centimeters Scale 1:500,000 General Map Collection. U.S. Geological Survey (Washington, D.C).
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1926. United States. Bureau of Public Roads. Shows Federal Aid Highway System, portions of System improved and under construction, national parks, monuments, and military reservations.; "Publi... U.S. Geological Survey (Washington, D.C).