Source: SK-Bra (Bratislava) Antiphonary of Bratislava I EC Lad.3Folio: 213vSequence: 3Full text: Ex Isaac tamen illa fecundatur semineFeast: AnnaeOffice: V2Genre: VPosition: 01Cantus ID: 601880aNotes: cantusindex.org: Ex Isaac tandem illam fecundavit semine
