R/data.R
mapUS52County.Rd
US 52 Counties Includes Alaska, Hawaii and Puerto Rico as well as DC.
mapUS52County
sf
US Census bureau. https://www.census.gov/geographies/mapping-files/time-series/geo/carto-boundary-file.html
if (FALSE) { library(rmap) plot(mapUS52County[,"subRegion"]) head(mapUS52County) }