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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2009. Center for Geographic Analysis, Harvard University. Global oil pipeline locations. Harvard Map Collection, Harvard College Library.
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.
1900. Harvard Map Collection, Harvard College Library and Autolit. de Kelch. This layer is a georeferenced raster image of the historic paper map entitled: Carte de la Sibérie: contenant l'indication des travaux exécutés ... Harvard Map Collection, Harvard Library.