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2000. U.S. Census Bureau. Geography Division. This polygon shapefile represents the unified school district boundaries in Puerto Rico. School districts are geographic entities within which stat... U.S. Census Bureau. Geography Division.
2010, 2011, 2012, and 2013. U.S. Census Bureau. Geography Division and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the 2010 Census urban areas in the United States. An urban area comprises a densely settled core of census tracts... Environmental Systems Research Institute (Redlands, Calif.).