E-MO-ms-773: Composer name in ms = '[P]etrus de [la] Rue' with 'la' written in musical notation / 'Canon - Quatuor in partes - hoc distingenere debes' on fol. 79v / Kyrie I: 'O salutaris hostia' (red ink) / Double texted Gloria and Credo / Pleni: 'Gemelli' / Benedictus: 'Gemelli' and 'Duo' / Agnus I is incomplete due to cut out fol. 84, Agnus II-III absent
