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#' Information on States
#'
#' Number of counties, land area, and population for the 50 states plus
#' the District of Columbia
#' @name statepps
#' @docType data
#' @format Date frame with the following 7 variables:
#' \describe{
#' \item{state}{state name}
#' \item{counties}{number of counties in state}
#' \item{cumcount}{cumulative number of counties}
#' \item{landarea}{land area of state, 1990 (square miles)}
#' \item{cumland}{cumulative land area}
#' \item{popn}{population of state, 1992}
#' \item{cumpopn}{cumulative population}
#' }
#' @references Lohr (1999). Sampling: Design and Analysis, Duxbury, p. TODO and
#' 445.
#' @export
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