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Cologny, Fondation Martin Bodmer, Cod. Bodmer 77,  Front cover – Guido Aretinus, Micrologus; Prologus in Antiphonarium; De ignoto cantu; Regulae rhythmicae
Cologny, Fondation Martin Bodmer, Cod. Bodmer 77, Front cover – Guido Aretinus, Micrologus; Prologus in Antiphonarium; De ignoto cantu; Regulae rhythmicae