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Subject
Boundaries
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Subject
Administrative and political divisions
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Institution
Stanford
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Place
Puerto Rico
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Year
1990
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1. County Boundaries of the United States, 1990
1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).