Contains datasets, including higher resolution boundary data, for use in the 'USAboundaries' package. These datasets come from the U.S. Census Bureau, the Newberry Library's 'Historical Atlas of U.S. County Boundaries', and Erik Steiner's 'United States Historical City Populations, 1790-2010'.
|License||CC BY-NC-SA 4.0|
|Package repository||View on GitHub|
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