The boundaries for geographical units in the United States of America contained in this package include state, county, congressional district, and zip code tabulation area. Contemporary boundaries are provided by the U.S. Census Bureau (public domain). Historical boundaries for the years from 1629 to 2000 are provided form the Newberry Library's 'Atlas of Historical County Boundaries' (licensed CC BY-NC-SA). Additional high resolution data is provided in the 'USAboundariesData' package; this package provides an interface to access that data.
|Author||Lincoln Mullen [aut, cre], Dr. William M. Scholl Center for American History and Culture, The Newberry Library [cph], United States Census Bureau [cph]|
|Date of publication||2016-01-04 11:05:17|
|Maintainer||Lincoln Mullen <email@example.com>|
|License||CC BY-NC-SA 4.0|
|Package repository||View on CRAN|
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