#' Loose dry bulk density of Valentine topdressing sand
#'
#' use for in-situ bulk density measurements on cleat mark cylinders and
#' backfilling cleat indentations to compute their volume.
#'
#'
#' @references [ASTM D1556-15e1](https://www.astm.org/Standards/D1556.htm)
#'
"vrc_sand_loose_density"
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