1900. University of Minnesota. Minnesota Population Center. This boundary file contains historic county boundaries for which the U.S. Census Bureau tabulated data and was produced by the Minnesota Population... Minnesota Population Center.
    
  
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      2010. Tele Atlas North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). U.S. Census Block Groups represents the U.S. Census block groups of the United States in the 50 states, the District of Columbia, and Puerto Rico. ESRI.
    
  
    
      2011. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). U.S. Census Block Groups represents the U.S. Census block groups of the United States in the 50 states, the District of Columbia, and Puerto Rico. Esri.
    
  
    
      2010. Tele Atlas North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). U.S. Census Tracts represents the U.S. Census tracts of the United States in the 50 states, the District of Columbia, and Puerto Rico. ESRI.
    
  
    
      2011. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). U.S. Census Tracts represents the U.S. Census tracts of the United States in the 50 states, the District of Columbia, and Puerto Rico. Esri.
    
  
    
      2010. Tele Atlas North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). U.S. Counties represents the counties of the United States in the 50 states, the District of Columbia, and Puerto Rico. ESRI.
    
  
    
      2011. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). U.S. Counties represents the counties of the United States in the 50 states, the District of Columbia, and Puerto Rico. Esri.
    
  
    
      Geological Survey (U.S.) and Environmental Systems Research Institute (Redlands, Calif.). U.S. National Atlas Cities represents cities and towns in the United States. ESRI.
    
  
    
      2010. Tele Atlas North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). U.S. States represents the 50 states, the District of Columbia, and Puerto Rico of the United States. ESRI.
    
  
    
      2011. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). U.S. States represents the 50 states, the District of Columbia, and Puerto Rico of the United States. Esri.