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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1918. Harvard Map Collection, Harvard College Library, Chalifour, J. E., and Canada. Dept. of the Interior. This layer is a georeferenced raster image of the historic paper map entitled: Map of the Dominion of Canada, J.E. Chalifour, Chief Geographer. It ... Harvard Map Collection, Harvard Library.
1724. Harvard Map Collection, Harvard Library, L'Isle, Guillaume de, 1675-1726, Ottens, R., 1698-1750, and Académie des sciences (France). This layer is a georeferenced raster image of the historic paper map entitled: Carte d'Europe : dressée pour l'usage du Roy sur les itineraires anc... Harvard Map Collection, Harvard Library.
2010. U.S. Census Bureau. Geography Division. This polygon data layer represents the 2010 TIGER/Line Census 111th congressional districts for the United States. The TIGER/Line Files are shapefi...
2010. U.S. Census Bureau. Geography Division. This polygon data layer represents the 2010 TIGER/Line Census combined statistical areas for the United States. The TIGER/Line Files are shapefiles...
2013. Rawson, Peg and United States. Bureau of Transportation Statistics. This polygon shapefile contains United States congressional district boundaries for 2013-2015. Congressional Districts are the 435 areas from which... United States. Bureau of Transportation Statistics.
2016. Hart Energy Publishing. This polygon shapefile represents counties in North America (Canada, Mexico, and the United States). Data includes county name and location by stat... Hart Energy Publishing.
1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2005. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).