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/usr/share/basemap/data/UScounties.prj is in python-mpltoolkits.basemap-data 1.0.7+dfsg-1.

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GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137,298.257222101]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]