#' 2010 Census gazetteer files for counties
#'
#' From the Census website: "The counties file contains data for primary legal
#' divisions or statistically equivalent entities in the 50 states, District of
#' Columbia and Puerto Rico as of the 2010 Census."
#'
#' @source \url{https://www.census.gov/geo/maps-data/data/gazetteer2010.html}
"county10"
#' 2010 Census gazetteer files for zctas
#'
#' From the Census website: "The ZIP Code Tabulation Area file contains data for
#' all ZIP Code Tabulation Areas (ZCTAs) in the 50 states, the District of
#' Columbia and Puerto Rico as of the January 1, 2010."
#'
#' @source \url{https://www.census.gov/geo/maps-data/data/gazetteer2010.html}
"zcta10"
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