Information organized by Tony Campbell, "Census of pre-sixteenth-century portolan charts" at maphistory.info, last visited June 16, 2011
nebis.ch
opac.nebis.ch
The signature reads Perinus Vessconte d’Janua fecit istam tabula Anno dni Mccc xxj in Venecia. A copy of the 1321 atlas can be found online at 1321 Perrino Vesconte atlas at Netzwerk von Bibliotheken
und Informationsstellen in der Schweiz (NEBIS, Suiza)
