This material came to the University Archives from Jesuit Hall, the Jesuit residence, several years after Bannon's death, but not before much of the contents of Bannon's file cabinets, described as "just class notes and tests," was discarded. Most of this collection consists of manuscripts by Bannon, including two volumes of memoirs, published copies of his works, and research notes. Bannon was associated with the Department of History at Saint Louis University for 34 years, 28 of them as chairman. This collection is organized into 8 series: 1. Clippings; 2. Correspondence; 3. Ephemera; 4. Financial Records; 5. Manuscripts; 6. Notes; 7. Teaching Materials; 8. Works.