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#' Search PLoS Journals subjects.
#'
#' @export
#' @template plos
#' @return Subject content, in addition to any other fields requested in a
#' data.frame.
#' @details See \url{https://journals.plos.org/plosone/browse} for subject areas.
#' @examples \dontrun{
#' plossubject('marine ecology', limit = 5)
#' plossubject(q='marine ecology', fl = c('id','journal','title'), limit = 20)
#' plossubject(q='marine ecology', fl = c('id','journal'),
#' fq='doc_type:full', limit = 9)
#' plossubject(q='marine ecology', fl = c('id','journal'),
#' fq=list('doc_type:full','!article_type_facet:"Issue%20Image"'),
#' limit = 9)
#' }
plossubject <- function(q = NULL, fl = 'id', fq = NULL, sort = NULL,
start = 0, limit = 10, sleep = 6, errors = "simple", proxy = NULL,
callopts=NULL, progress = NULL, ...) {
searchplos(q=paste('subject:', '"', q, '"', sep=""), fl=fl, fq=fq,
sort=sort, start=start, limit=limit,
sleep=sleep, errors = errors,
proxy = proxy, callopts = callopts, progress = progress, ...)
}
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