1. University of Pennsylvania, Ms. Codex 1559 Title: Scale of perfection Author: Walter Hilton Place: Italy Date: 1510.
2. University of Pennsylvania, Ms. Codex 67 Title: Regulae artificialis memoriae. Istoria Attile Hunnorum regis. Author: Jacopo Ragone Place: Italy Date: 1471.
3. University of Pennsylvania, Ms. Codex 840 Title: Orthographia Author: Porcellio Place: Italy Date: 1460.