Source: SK-BRl (Bratislava) Rkp. 387 Missale NotatumFolio: 148vSequence: 4Full text: Tu es Petrus*Feast: Petri, PauliOffice: MASSGenre: CmCantus ID: g00262Image link: http://147.213.131.4:85/digi/Rkp_zv_387/LKB___RKP_ZV_387_____24TL/SK/1_1_0148V.h…