1. University of Pennsylvania, Ms. Codex 67 Title: Regulae artificialis memoriae. Istoria Attile Hunnorum regis. Author: Jacopo Ragone Place: Italy Date: 1471.
2. University of California, Berkeley, BANC MS UCB 5 Title: Treatise on mnemonics and memory Author: Nicolaus Peranzonus Place: Venice Date: approximately 1510