Lux Veritatis
On the Council of Ephesus
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This catalogue
Lux Veritatis (1931). On the Council of Ephesus. docs.church. https://docs.church/lux-veritatis
Official citation
Pius XI, Lux Veritatis (25 December 1931). https://www.papalencyclicals.net/pius11/p11verit.htm