Carefully indexed source materials in the original languages are given by C. Mirbt, Quellen zur Geschichte des Papsttums und des riimischen Katholizismus (2nd enlarged ed., Tubingen, 1901); many fragments in translation under " Papacy " in History for Ready Reference, ed.
Leopold Delisle, and is admirably indexed.
Yahoo has indexed 95 pages and is about four days behind the page additions.
Information verified and indexed by numbers from the NIR would be easily cross-referenced in any database or set of databases.
Once indexed, searching is very fast, allowing interactive interrogation of the text.
