U.S. County Boundaries : Esri Data Maps 2012 in EarthWorks

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U.S. County Boundaries : Esri Data Maps 2012

Description: U.S. County Boundaries represents the boundary lines of the counties of the United States.
Publisher: Esri
Year: 2011
Held by: Harvard
More details at: http://opengeometadata.stanford.edu/metadata/org.opengeoportal/sde:SDE2.ESRI12USDTL_CNTY_LN/fgdc.html