281. University of Pennsylvania, Oversize Ms. Codex 80 Title: Statutes Place: Città di Castello Date: [between 1261 and 1273]
282. University of Pennsylvania, Oversize Ms. Codex 81 Title: Proceedings Author: Podestà of Perugia Place: Perugia Date: 1448-1449.
283. University of Pennsylvania, Ms. Codex 825 Title: Summa logicae Author: William of Ockham Place: Bologna Date: [between 1350 and1399]
284. University of Pennsylvania, Oversize Ms. Codex 826 Title: De astronomia Author: Ǧābir Ibn-Aflāḥ Place: France Date: [1300?]
285. University of Pennsylvania, Oversize Ms. Codex 827 Title: De improbatione concentricorum et epicyclorum Author: Henry of Langenstein Place: England Date: [between 1362 and 1399]
286. University of Pennsylvania, Ms. Codex 828 Title: Liber de homine Author: Ramon Llull Place: Italy Date: [14--]
287. University of Pennsylvania, Ms. Codex 829 Title: Miscellany Place: Italy Date: [between 1459-1484]
288. University of Pennsylvania, Ms. Codex 834 Title: Commentarius cum quaestionibus in universam Aristotelis philosophiam naturalem Author: John Cornelius Place: Germany Date: [1594-1595]
289. University of Pennsylvania, Ms. Codex 838 Title: Erotopaegnion Author: Girolamo Angeriano Place: Naples Date: [1510?]
290. University of Pennsylvania, Ms. Codex 839 Title: Historia gestorum Alexandri pueri magni Place: Germany Date: [1400-1450]