P-AR (Arouca) Museu Regional de Arte Sacra do Mosteiro de Arouca Res. Ms. 021
Paper sheet, with the notated antiphon Requiem aeternam, glued on the verse of the last folio. Serving as the two final flyleaves, there's a bifolio fragment of a book of Canonical Law (with occasional references to the Archbishop of Compostela), with marginal comments (glosae). Paper sheet, with several intonation formulas, glued on the inside of the back cover.