To cite package ‘USAboundariesData’ in publications use:

  Mullen L (2021). _USAboundariesData: Datasets for the 'USAboundaries'
  package_. R package version 0.4.0, ,
  <https://github.com/ropensci/usaboundariesdata>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {USAboundariesData: Datasets for the 'USAboundaries' package},
    author = {Lincoln Mullen},
    year = {2021},
    note = {R package version 0.4.0, 
},
    url = {https://github.com/ropensci/usaboundariesdata},
  }