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1द्वारा Gregory XVI, Pope, 1765-1846Location: John J. Burns Library, Boston College
प्रकाशित 1839
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2द्वारा Harold, William Vincentअन्य लेखक: “...Gregory, XVI, Pope, 1765-1846...”
प्रकाशित 1828
Location: Hesburgh Libraries, University of Notre Dame
पुस्तक