Source: SK-BRl (Bratislava) Rkp. 387 Missale NotatumFolio: 133rSequence: 3Full text: Laetamini in domino*Feast: Tiburtii, ValerianiOffice: MASSGenre: OfCantus ID: g00116Image link: http://147.213.131.4:85/digi/Rkp_zv_387/LKB___RKP_ZV_387_____24TL/SK/1_1_0133R.h…