places: Access the Geonames Data Export Service

#' internal lookup table
#' @description A lookup table
#' @format{A data frame with 252 observations on the following 33 variables.
#' \describe{
#'  \item{\code{iso}}{a character vector}
#'  \item{\code{iso3}}{a character vector}
#'  \item{\code{iso_numeric}}{a character vector}
#'  \item{\code{fips}}{a character vector}
#'  \item{\code{country}}{a character vector}
#'  \item{\code{capital}}{a character vector}
#'  \item{\code{area_in_sq_km}}{a character vector}
#'  \item{\code{capital_population}}{a character vector}
#'  \item{\code{continent}}{a character vector}
#'  \item{\code{tld}}{a character vector}
#'  \item{\code{currencycode}}{a character vector}
#'  \item{\code{currencyname}}{a character vector}
#'  \item{\code{phone}}{a character vector}
#'  \item{\code{postal_code_format}}{a character vector}
#'  \item{\code{postal_code_regex}}{a character vector}
#'  \item{\code{languages}}{a character vector}
#'  \item{\code{country_geonameid}}{a character vector}
#'  \item{\code{neighbours}}{a character vector}
#'  \item{\code{equivalentfipscode}}{a character vector}
#'  \item{\code{un_global_code}}{a numeric vector}
#'  \item{\code{un_global_name}}{a character vector}
#'  \item{\code{un_region_code}}{a numeric vector}
#'  \item{\code{un_region_name}}{a character vector}
#'  \item{\code{un_sub_region_code}}{a numeric vector}
#'  \item{\code{un_sub_region_name}}{a character vector}
#'  \item{\code{un_intermediate_region_code}}{a numeric vector}
#'  \item{\code{un_intermediate_region_name}}{a character vector}
#'  \item{\code{un_country_or_area}}{a character vector}
#'  \item{\code{un_m49_code}}{a numeric vector}
#'  \item{\code{un_least_developed_countries_ldc}}{a numeric vector}
#'  \item{\code{un_land_locked_developing_countries_lldc}}{a numeric vector}
#'  \item{\code{un_small_island_developing_states_sids}}{a numeric vector}
#'  \item{\code{un_developed_or_developing_countries}}{a character vector}
#'}
#'}
#' @keywords internal
#' @examples lookup
"lookup"