Brush up on your Latin for this site! The official site of the Cooperatorum Veritas Societas, Documenta Catholica Omnia currently has over "18,000 documents which contain more than 23,000 writings of Popes, almost all the Migne Patrologia Latina and most of the Migne Patrologia Graeca. This site is very useful for both study and research."
Read why they have earned an excellent (green) fidelity rating from CatholicCulture.org.
Documenta Catholica Omnia is in our sidebar under 'Church Documents.'