1. Rutgers, The State University of New Jersey, MC 1220:10 Title: Decretals Author: Gregory IX Place: Italy Date: s. XIV; 1300-1399
4. University of Oregon, MS 144 Title: Decretals Author: Gregory IX Place: France Date: between 1301 and 1325.
5. Harry Ransom Center, MS 3327, Container 191 Title: Papal bull Author: Gregory IX Place: Italy Date: 1234 July 13