1. Newberry Library, VAULT folio Case MS 150 DS ID: DS18203 Title: Indulgence and Letter Author: Catholic Church and Sixtus IV Place: Florence and Italy Date: 1481 April 25.
2. Newberry Library, VAULT Wing MS ZW 1 .4b DS ID: DS18256 Title: Letter Author: Basil of Caesarea Place: Italy Date: approximately 1450