Quantum redactiones paginae "Guido Aretinus" differant

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m →‎Nexus externi: rectificatio
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[[el:Γκουίντο ντ' Αρέτσο]]
[[en:Guido of Arezzo]]
[[eo:Guido de Arezzo]]
[[es:Guido de Arezzo]]
[[et:Guido Arezzost]]