Healy K (2020). uscenpops: US Census Counts. R package version 0.1.0, http://kjhealy.github.io/uscenpops.

@Manual{uscenpops,
  title = {uscenpops: US Census Counts},
  date = {2020},
  author = {Kieran Healy},
  year = {2020},
  note = {R package version 0.1.0},
  url = {http://kjhealy.github.io/uscenpops},
}