Columbia subject headings:
Catholic Church--Clergy.
Catholic Church--Scandinavia.
Church history--Middle Ages, 600-1500.
Missionaries.
Scandinavia--Church history.
Harvard subject headings:
Catholic Church--Clergy.
Catholic Church--Scandinavia.
Church history--Middle Ages, 600-1500
Missionaries
Scandinavia--Church history.
Princeton subject headings:
Catholic Church--Clergy.
Catholic Church--Scandinavia.
Church history--Middle Ages, 600-1500.
Missionaries.
Scandinavia--Church history.