TheoFonsAd fontes fideiTheoFonsAd fontes fideiThe Latin editio typica, the magisterium's reference text. Its § numbering is canonical — the Latin § answers the same § in the vernacular editions.
53 — 53 Latin editions ingested
The oldest encyclicals (Rerum novarum, Mater et magistra, Pacem in terris) carry no section numbers in their Latin text: the numbered division is a vernacular addition. Their Latin needs rank alignment against the Acta facsimile, like Quadragesimo anno.