Columbia subject headings:
Harvard subject headings:
Bloemhof (Abbey : Wittewierum, Netherlands)--History--Sources.
Monasticism and religious orders--Netherlands--History--Middle Ages, 600-1500--Sources.
Wittewierum (Netherlands)--Church history--Sources.
Princeton subject headings:
Bloemhof (Abbey : Wittewierum, Netherlands)--History.
Wittewierum (Netherlands)--Church history.