#' @name lookup.states
#' @docType data
#' @aliases lookup.states, states
#' @title States and related areas dataset
#' @description This data set provides a variety of fields for US States, DC, PR, and Island Areas,
#' including FIPS codes and area in square miles or square kilometers, for example, from the Census Bureau.
#' @details For information on FIPS codes, see \url{http://www.census.gov/geo/reference/ansi.html},
#' and also see \url{https://www.census.gov/geo/reference/geoidentifiers.html} \cr\cr
#' Regarding Island Areas see \url{http://www.census.gov/geo/reference/gtc/gtc_island.html} which states the following:
#' Separate from the Island Areas is the term "U.S. Minor Outlying Islands."
#' The Island Areas of the United States are
#' American Samoa, Guam, the Commonwealth of the Northern Mariana Islands (Northern Mariana Islands), and the United States Virgin Islands.
#' The U.S. Minor Outlying Islands refers to certain small islands under U.S. jurisdiction in the Caribbean and Pacific:
#' Baker Island, Howland Island, Jarvis Island, Johnston Atoll, Kingman Reef, Midway Islands, Navassa Island, Palmyra Atoll, and Wake Island.
#' These areas usually are not part of standard data products.
#' @seealso \code{\link[ejanalysis]{get.state.info}} in \pkg{ejanalysis} package (\url{http://ejanalysis.github.io/ejanalysis/}),
#' and \code{\link{state.abb}} via \code{data(state)}
#' @source Derived from \url{https://www.census.gov/geo/reference/state-area.html} (for area data in square miles etc.)
#' obtained 4/2015, and FIPS codes from Census Bureau, but
#' other than the exact areas in square km, this table would be the same for Census 2020.
#' @keywords datasets
#' @format A data.frame with 58 rows (States etc.) and 26 columns (variables like statename).
#' See \code{\link[ejanalysis]{get.state.info}} for more details.
#' \itemize{
#' \item [1,] "statename"
#' \item [2,] "FIPS.ST"
#' \item [3,] "ST"
#' \item [4,] "ftpname"
#' \item [5,] "REGION"
#' \item [6,] "is.usa.plus.pr"
#' \item [7,] "is.usa"
#' \item [8,] "is.state"
#' \item [9,] "is.contiguous.us"
#' \item [10,] "is.island.areas"
#' \item [11,] "area.sqmi"
#' \item [12,] "area.sqkm"
#' \item [13,] "landarea.sqmi"
#' \item [14,] "landarea.sqkm"
#' \item [15,] "waterarea.sqmi"
#' \item [16,] "waterarea.sqkm"
#' \item [17,] "inland.sqmi"
#' \item [18,] "inland.sqkm"
#' \item [19,] "coastal.sqmi"
#' \item [20,] "coastal.sqkm"
#' \item [21,] "greatlakes.sqmi"
#' \item [22,] "greatlakes.sqkm"
#' \item [23,] "territorial.sqmi"
#' \item [24,] "territorial.sqkm"
#' \item [25,] "lat"
#' \item [26,] "lon"
#' }
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