At http://www.lib.utexas.edu/usage_statement.html?maps=yes the website says "most of the maps in the PCL Map Collection" are in the public domain and this particular map is in the PCL collection indexed at http://www.lib.utexas.edu/maps/world_cities.html where it says "The following maps were produced by U.S. Government agencies as noted" and it notes "U.S. National Atlas, 1970" for this particular map. The atlas was published by USGS, a US government agency.
{{PD}} This image was cropped from a 1970 map of the [[Baltimore-Washington Metropolitan Area]] found at http://www.lib.utexas.edu/maps/world_cities/washington_baltimore.jpg The source image is in the public domain.
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determination method or standard: work of the federal government of the United States
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