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#' Index of Countries.
#'
#' Data frame containing a normalized index of countries.\cr
#' Data are used by \code{\link{biblioAnalysis}} function
#' to extract Country Field of Cited References and Authors.
#'
#' @format A data frame with 199 rows and 4 variables:
#' \describe{
#' \item{countries}{country names}
#' \item{continent}{continent names}
#' \item{Longitude}{country centroid longitude}
#' \item{Latitude}{country centroid latitude}
#' }
#'
#' @name countries
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