1997. United States. National Imagery and Mapping Agency. This datalayer is a polygon coverage representing large urban areas (built-up areas) worldwide and was published as part of the USGS Global GIS : g... American Geological Institute.
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2010. U.S. Census Bureau. Geography Division. This polygon data layer represents the 2010 TIGER/Line census metropolitan divisions for the United States. The TIGER/Line Files are shapefiles and...
2010. U.S. Census Bureau. Geography Division. This polygon data layer represents the 2010 TIGER/Line Census metropolitan statistical area/micropolitan statistical areas for the United States. T...
2010. DeLorme Publishing Company and Environmental Systems Research Institute (Redlands, Calif.). World Urban Areas represents the major urban areas of the world. ESRI.
2010. DeLorme (Firm) and Environmental Systems Research Institute (Redlands, Calif.). World Urban Areas represents the major urban areas, with populations greater than 10,000, of the world. Esri.