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The four bifolia seem to comprise an entire quire containing the Canon of the Mass, along with musical notation for the Pater Noster prayer and instructions for the celebrant.
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Scherpenheuvel-Zichem, Abdij der Norbertijnen van Averbode, Archief, Sectie IV, hs. 417, 11, fol. [5]v – Noted missal — https://fragmentarium.ms/view/page/F-gybf/7120/69806/0