To cite the USAboundaries package in publications, please cite the paper in the Journal of Open Source Software: Lincoln A. Mullen and Jordan Bratt, "USAboundaries: Historical and Contemporary Boundaries of the United States of America," Journal of Open Source Software 3, no. 23 (2018): 314, https://doi.org/10.21105/joss.00314. A BibTeX entry for LaTeX users is @Article{, title = {{USAboundaries}: Historical and Contemporary Boundaries of the United States of America}, author = {Lincoln A. Mullen and Jordan Bratt}, journal = {Journal of Open Source Software}, year = {2018}, volume = {3}, issue = {23}, pages = {314}, url = {https://doi.org/10.21105/joss.00314}, doi = {10.21105/joss.00314}, }