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The Years of the Cupola. Digital archive of the sources of the Opera di Santa Maria del Fiore, 1417-1436, Margaret Haines, ed., Florence, Opera di Santa Maria del Fiore, copyright year of the edition consulted (present at the bottom of every HTML page). Finally give the URL address of the site consulted (http://www.operaduomo.firenze.it/cupola or http://duomo.mpiwg-berlin.mpg.de) and, in parentheses, the date of access to the data.

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