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Catholic Encyclopedia: St. Willehad
http://www.newadvent.org/cathen/15628a.htm
Short biography of the missionary and bishop, d. 789.
Catholic Online: St. Willehad
http://www.catholic.org/saints/saint.php?saint_id=5563
Brief biography.
Willehad of Bremen
http://www.saintpatrickdc.org/ss/1108.htm#will
Biography of the saint.