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1. United States Census Block Centroid Populations, 2010

2010. U.S. Census Bureau. This point shapefile represents the populations of the U.S. Census blocks as centroids for the United States. U.S. Census blocks nest within all ot... Environmental Systems Research Institute (Redlands, Calif.).

2. U.S. States, 2007-2013

2010. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the 50 states, the District of Columbia, and Puerto Rico of the United States at 1:100,000 scale.This layer also ... Environmental Systems Research Institute (Redlands, Calif.).