#' Data - Chapter 1 Data (Place Document Matrices)
#'
#' A list of 5 place-document matrices, dated 1473-1599, 1600-1639,
#' 1640-1659, 1660-1679, and 1680-1699.
#'
#' @format List
#'
#' @examples
#' # Load the data.
#' data(ch1_place_doc)
"ch1_place_doc"
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