1998. Bureau of Transportation Statistics. The Bureau of Economic Analysis (BEA)database is a Geographic polygon dataset representing county based economic regions for the United States. Bureau of Transportation Statistics.
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1998. National Atlas of the United States and the United States Geological Survey, Harvard Geospatial Library, and Environmental Systems Research Institute, Inc. (ESRI). U.S. National Atlas Cities represents cities and towns in the United States. Environmental Systems Research Institute, Inc. (ESRI).
1998. National Atlas of the United States and the United States Geological Survey. U.S. National Atlas Cities represents cities and towns in the United States. Environmental Systems Research Institute, Inc. (ESRI).
1998. National Atlas of the United States and the United States Geological Survey. U.S. National Atlas Cities represents cities and towns in the United States. Environmental Systems Research Institute, Inc. (ESRI).