11. Newberry Library, VAULT oversize box Case MS Fragment 11 DS ID: DS18306 Title: Registrum Gregorii and Registrum epistolarum Author: Gregory I Place: Italy Date: between 850 and 899
12. Columbia University Rare Book & Manuscript Library, MS X893.19 Si9 DS ID: DS19982 Title: Letters Place: Italy Date: 1817-1828].