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Countries, 2nd order divisions
Second-order divisions of a nation such as parishes, boroughs, counties, municipios, or judicial divisions, and independent cities such as those in Maryland, Missouri, Nevada, and Virginia. [Adapted from USGS Circ 1048]
Alexandria Digital Library Feature Type Thesaurus
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County boundaries 2001: map layer description file [More info]
One of many map layers of the National Atlas giving county boundaries with metadata. The county boundaries map layer can be downloaded in shapefile or SDTS formats.
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