1. University of Pennsylvania, LJS 26 Title: Algorismus Author: Johannes de Sacrobosco Place: Italy Date: [between 1225 and 1275]
2. University of Pennsylvania, LJS 216 Title: Sphaera mundi Author: Johannes de Sacrobosco Place: Paris Date: [between 1256 and 1270]
5. Princeton University, Kane MS. 50. Title: De institutione arithmetica Place: England Date: between 1200 and 1400