Bern, Burgerbibliothek, Cod. A 91.21, f. 6v – Guido Aretinus : Micrologus, Regulae rhythmicae (fragment)
http://www.e-codices.ch/fr/bbb/A0091-21/6v
Bern, Burgerbibliothek / Cod. A 91.21 – Guido Aretinus : Micrologus, Regulae rhythmicae… / f. 6v |