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CATHOLIC ENCYCLOPEDIA: Pope Gregory XIII http://www.newadvent.org/cathen/07001b.htm |
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Pope Gregory XIII - Wikipedia http://en.wikipedia.org/wiki/Pope_Gregory_XIII |
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Pope GREGORY XIII http://www.catholic-forum.com/saints/pope0226.htm |
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Biography – Pope Gregory XIII – The Papal Library http://papal-library.saint-mike.org/GregoryXIII/Biography.html |