# --------------------------------------------
# CITATION file created with {cffr} R package
# See also: https://docs.ropensci.org/cffr/
# --------------------------------------------
 
cff-version: 1.2.0
message: 'To cite package "USAboundaries" in publications use:'
type: software
license: MIT
title: 'USAboundaries: Historical and Contemporary Boundaries of the United States
  of America'
version: 0.5.0
doi: 10.21105/joss.00314
identifiers:
- type: doi
  value: 10.32614/CRAN.package.USAboundaries
abstract: 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
  data is provided in the 'USAboundariesData' package; this package provides an interface
  to access that data.
authors:
- family-names: Mullen
  given-names: Lincoln
  email: lincoln@lincolnmullen.com
  orcid: https://orcid.org/0000-0001-5103-6917
- family-names: Bratt
  given-names: Jordan
  email: jfbratt@gmail.com
  orcid: https://orcid.org/0000-0001-9051-7203
- family-names: Ziebert
  given-names: Jacci
  email: jacciziebert@gmail.com
preferred-citation:
  type: article
  title: 'USAboundaries: Historical and Contemporary Boundaries of the United States
    of America'
  authors:
  - family-names: Mullen
    given-names: Lincoln A.
  - family-names: Bratt
    given-names: Jordan
    email: jfbratt@gmail.com
    orcid: https://orcid.org/0000-0001-9051-7203
  journal: Journal of Open Source Software
  year: '2018'
  volume: '3'
  issue: '23'
  url: https://doi.org/10.21105/joss.00314
  doi: 10.21105/joss.00314
  start: '314'
repository: https://ropensci.r-universe.dev
repository-code: https://github.com/ropensci/USAboundaries
commit: 766ab5835623b0d64b7ab093855183e8a630dc0a
url: https://docs.ropensci.org/USAboundaries
date-released: '2025-10-13'
contact:
- family-names: Ziebert
  given-names: Jacci
  email: jacciziebert@gmail.com