Columbia subject headings:
Christian saints--Netherlands.
Missionaries--Netherlands.
Netherlands--Church history.
Willibrord, Saint, 658?-739.
Harvard subject headings:
Christian saints--Netherlands.
Missionaries--Netherlands.
Netherlands--Church history.
Willibrord, Saint, 658?-739.
Princeton subject headings:
Christian saints--Netherlands.
Missionaries--Netherlands.
Netherlands--Church history.
Willibrord, Saint, 658?-739.