P-Cua (Coimbra) Arquivo Distrital e da Universidade IV-3ª Gav. 44 (12)
Comparison via Cantus Database shows that this fragment shares with Toledo Catedral - Archivo y Biblioteca Capítulares, 44.2 alone the same chants in the same order for the feast of Exaltatio Crucis: this cautiously allows to posit some degree of affinity between the two documents.
The two sources also share the same chants and order for the feast of Commune Plurimorum Martyrum, but this second feast is much more standardized and fixed across sources than that for the first one.
On fol. Av, top and bottom: INV./BOL. 96 (38) IV-3º S. - GV.44 (12)