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1. 1:1,000,000-Scale County Boundary Lines of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile contains the county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. This layer was derived from t... Geological Survey (U.S.).

2. Global Map: 1:1,000,000-Scale Political Boundary Lines of the United States, 2014

2014. National Atlas of the United States. This line shapefile includes Global Map data showing the counties and equivalent entities of the United States, Puerto Rico, and the U.S. Virgin Is... National Atlas of the United States.

3. United States County Boundaries, 2010-2011

2010. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). This line shapefile represents the county boundary lines of the United States at 1:100,000 scale.This layer is part of the 2014 ESRI Data and Maps ... Environmental Systems Research Institute (Redlands, Calif.).

4. U.S. County Boundaries, 2013

2011. TomTom North America, Inc. U.S. County Boundaries represents the boundary lines of the counties of the United States.

5. U.S. County Boundaries, 2015

2010. TomTom North America, Inc. and Esri. U.S. County Boundaries represents the boundary lines of the counties and county equivalents of the United States. Esri.

6. U.S. State Boundaries, 2010-2011

2010. TomTom North America, Inc. and Environmental Systems Research Institute (Redlands, Calif.). This line shapefile represents the boundary lines of the states of the United States at 1:100,000 scale. This layer is part of the 2014 ESRI Data a... Environmental Systems Research Institute (Redlands, Calif.).

7. U.S. State Boundaries, 2013

2011. TomTom North America, Inc. U.S. State Boundaries represents the boundary lines of the states of the United States.