- Von P. Walden
- Washington State University
- Department of Civil and Environmental Engineering
- 30 March 2020
- Many thanks to the New York Times for making county-level covid-19 data available at https://github.com/nytimes/covid-19-data
- Geographic data for US counties acquired from https://catalog.data.gov/dataset/tiger-line-shapefile-2017-nation-u-s-current-county-and-equivalent-national-shapefile
- FIPS table for US States acquired from https://gist.github.com/dantonnoriega/bf1acd2290e15b91e6710b6fd3be0a53