#' US county map data
#'
#' US county map data form Census.
#'
#' A data frame with seven variables.
#'
#' @source \url{http://www.census.gov/geo/maps-data/data/cbf/cbf_counties.html}
"county"
#' US state map data
#'
#' US state map data form Census.
#'
#' A data frame with seven variables.
#'
#' @source \url{http://www.census.gov/geo/maps-data/data/cbf/cbf_state.html}
"state"
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