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#' Historical Population Data for Urban Europe
#'
#' All cities that had a population of at least 10,000 at some point between
#' 1500-1800 are included.
#'
#' @format A data frame with 2653 rows and 4 columns:
#' \describe{
#' \item{\code{city}}{Character. City name (in native language.)}
#' \item{\code{region}}{Character. Region that city belongs to. One of the
#' following: \itemize{
#' \item Scandinavia
#' \item England and Wales
#' \item Scotland
#' \item Ireland
#' \item The Netherlands
#' \item Belgium
#' \item Germany
#' \item France
#' \item Switzerland
#' \item Northern Italy
#' \item Central Italy
#' \item Southern Italy
#' \item Spain
#' \item Portugal
#' \item Austria and Czechoslovakia
#' \item Poland}}
#' \item{\code{year}}{Integer.}
#' \item{\code{population}}{Integer. Population in the thousands. 0 represents
#' a population under 1,000 (such cities are presented, in De Vries' words,
#' "for information only"). \code{NA} is used when the population value is
#' unknown.}
#' }
#'
#' @note This table can be joined to the \link{city_coords} table by the
#' \code{city} column.
#'
#' @source Jan De Vries, \emph{European Urbanization, 1500-1800} (Cambridge:
#' Harvard University Press, 1984), Appendix 2. (De Vries' sources for these
#' numbers are cataloged in Appendix 2.)
"europop"
#' Coodinates of European Cities
#'
#' @format A data frame with 379 rows and 3 columns
#' \describe{
#' \item{\code{lat}}{Double. Latitude.}
#' \item{\code{lon}}{Double. Longitude.}
#' \item{\code{city}}{Character. City name.}
#' }
#' @note This table can be joined to the \link{europop} table by the \code{city}
#' column.
"city_coords"
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