1. Newberry Library, VAULT folio Case MS 5170 Bookmark DS ID: DS17716 Title: Letter Author: Francesco I de' Medici Place: Italy and Ferrara Date: 1559 [that is, 1560] Feb. 22.
2. Newberry Library, VAULT folio Case MS 5072 no.1 Bookmark DS ID: DS18253 Title: Letter Author: Alphonsus Pantius Place: Ferrara and Italy Date: 1569 Mar. 2.