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#' Zip Code reference table.
#'
#' A data frame containing the longitude and latitude for zip codes.
#'
#' @format A data frame with 33144 rows and 3 variables:
#' \describe{
#' \item{zip}{zip code, numeric}
#' \item{lat}{latitude, numic}
#' \item{long}{long, numeric}
#' }
#' @source \url{http://www.census.gov/geo/maps-data/data/gazetteer2016.html}
"zipcodes"
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