Papal act collections — concordance

Before the Acta Apostolicae Sedis (1909→), the Holy See published its acts in the Acta Sanctae Sedis (1865-1908) and, further back, in a collection proper to each pontificate. This page shows which text occupies which pages, and how many corpus citations rest on it.

These are not third-party sources but the Holy See's official record before it bore that name — same authority, same function, same manner of citation. Rerum novarum is from 1891, so it lies outside the Acta by construction: its address is in the Acta Leonis XIII, and without this table its page citations would have nowhere to land. The catalogue is harvested from the corpus itself — every note that pairs a title with its address is an entry — then arbitrated and committed. Where several apparatus disagree, the better-attested reading wins and the loser is reported, never silently dropped.