The Atti Ufficiali della Santa Sede, part of the Archive of the Holy See in Rome, offers a digital library containing PDF versions of Holy See public documents starting in the second half of the 19th century to nowadays.

Acta Sanctae Sedis, 1865-1909

Acta Apostolicae Sedis, 1909-2007

Atti e documenti della Santa Sede relativi al periodo della II Guerra Mondiale, 11 vols.