Search for "author:(Dufferin and Ava, Harriot Georgina Blackwood, Marchioness of, 1843?-1936)" found nothing
Try limiting your search to just one of these... author:(Dufferin or and or Ava, or Harriot or Georgina or Blackwood, or Marchioness or of, or 1843?-1936)
Try the "More search options" page.