Source: PL-Wn 12496 IV Graduale cistercienseFolio: 065rSequence: 13Feast: Cathedra PetriOffice: MASSGenre: GrVCantus ID: g00027aMode: 2TFull text: Confiteantur domino misericordiae ejus et mirabilia ejus filiis hominum External image link: Image link