Search for "author:(Mühlbach, L. (Luise), 1814-1873) title:(The Empress Josephine : an historical romance / by Louisa Mu̲hlbach.)" found nothing
Try limiting your search to just one of these... author:(Mühlbach, or L. or (Luise), or 1814-1873) or title:(The or Empress or Josephine or : or an or historical or romance or / or by or Louisa or Mu̲hlbach.)
Try the "More search options" page.