1999. Bureau of Transportation Statistics, (comp.). The 106th Congressional District Boundaries data set contains geographic information for the political entities of the Congressional districts of t... Bureau of Transportation Statistics.
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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.
1995. Bureau of Transportation Statistics, (comp.). National Transportation Analysis Regions (NTAR) divide the U.S. into 89 areas that delineate the functional geography transportation demand. Bureau of Transportation Statistics.