1943. 2010-08-24T13:03:10Z. 2015-10-27T22:25:30Z. United States. Public Roads Administration. U.S. Geological Survey. English. Public. United States.
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1939. 2010-08-24T13:07:56Z. 2015-10-27T22:25:30Z. United States. Bureau of Public Roads. U.S. Geological Survey. English. Public. United States.