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Catholic Encyclopedia
http://www.newadvent.org/cathen/09637c.htm
St. Marcellina, consecrated virgin, blood sister of St. Ambrose, d. about 398.
Catholic Online
http://saints.catholic.org/saints/marcellina.html
Short biography of St. Marcellina.
For All the Saints
http://www.saintpatrickdc.org/ss/0717.htm#marc
Biographical sketch of St. Marcellina.