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Catholic Encyclopedia
http://www.newadvent.org/cathen/08449a.htm
St. John Baptist de Rossi, priest, canon, preacher, d. 1764.
Catholic Online
http://saints.catholic.org/saints/johnbaptistrossi.html
Short hagiography of St. John Baptist Rossi.
For All the Saints
http://www.saintpatrickdc.org/ss/0523.htm#john
Biography of St. John Baptist de Rossi.