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Catholic Encyclopedia
http://www.newadvent.org/cathen/05627a.htm
SS. Eustachius and companions, martyrs in 188.
Catholic Online
http://saints.catholic.org/saints/eustachius1.html
Pious reflection on SS. Eustachius and companions, by an unknown hand.
Patron Saints Index
http://www.catholic-forum.com/saints/sainte17.htm
Profile of St. Eustachius. Illustrated.