#' Unit Conversion - Area - Square Mile to Acre
#'
#' Performs a conversion of areas from square miles (U.S. Survey) to acres.
#'
#' @param x Vector - Values in units of square miles
#'
#' @return x, but converted to acres
#'
#' @references
#' NIST. Handbook 133 - Checking the Net Contents of Packaged Goods - Appendix E - General Tables of Units of Measurement. 2020.
#' https://www.nist.gov/system/files/documents/2019/12/03/00-20-h133-apdxE_final-17.pdf
unitconversion.acre.to.square.mile <- function(
x = 1
) {
x / 640
}
#' @rdname unitconversion.acre.to.square.mile
unitconversion.ac.to.sq.mi <- unitconversion.acre.to.square.mile
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