1. Newberry Library, VAULT Ayer MS 1275 no. 1 DS ID: DS17667 Title: Letter Author: Juan de Zumárraga Place: Mexico City Date: 1537 Nov.
2. Newberry Library, VAULT folio Case MS 5170 DS ID: DS17716 Title: Letter Author: Francesco I de' Medici Place: Italy and Ferrara Date: 1559 [that is, 1560] Feb. 22.