#' 2010 ZCTA to County Relationship File
#'
#' This dataset provides simple relationships between the 2010 ZCTAs and
#' Census Counties. ZIP Code Tabulation Areas (ZCTAs) are, according to the
#' Census, "generalized areal representations of United States Postal Service (USPS) ZIP
#' Code service areas."
#'
"zcta_county_rel_10"
#' 2010 ZCTA to Tract Relationship File
#'
#' This dataset provides simple relationships between the 2010 ZCTAs and
#' Census Tracts. ZIP Code Tabulation Areas (ZCTAs) are, according to the
#' Census, "generalized areal representations of United States Postal Service (USPS) ZIP
#' Code service areas."
#'
"zcta_tract_rel_10"
#' ZIP Code to ZCTA Crosswalk Table
#'
#' ZIP Code to ZCTA Crosswalk Table developed by John Snow, Inc. (JSI). The
#' data is for the 2014 UDS report data.
#'
#' @source \url{http://www.udsmapper.org/zcta-crosswalk.cfm}
"zipzcta"
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