#' @param variable (optional) Character vector indicating one or more variables. Accepts only
#' general identification codes, e.g. `"ferro"` and `"carbono"`. If missing, then a set of standard
#' identification variables is downloaded. Use `variable = "all"` to download all variables. See
#' \sQuote{Details} for more information.
#' @param stack (optional) Logical value indicating if tables from different datasets should be
#' stacked on a single table for output. Requires `standardization = list(units = TRUE)` -- see
#' below. Defaults to `stack = FALSE`, the output being a list of tables.
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