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Gregory XV
Works
Constitutions
- Omnipotentis Dei, 20 March, 1623
Papal bulls
- Aeterni Patris, 15 November, 1621
Works about Pope Gregory XV
- "Gregory XV." in the Encyclopædia Britannica, 9th ed.
- "Gregory XV." in the Encyclopædia Britannica, 11th ed.

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