Information on differentia
In the original Cantus index for this manuscript, differentiae were identified by their last note and an arbitrarily-assigned number to distinguish between differentiae that shared the same last note, within the same mode.
Boyce, James, O. Carm. Inventory of Salamanca, Catedral - Archivo Musical, 6. Edited by Andrew Mitchell and Kathleen Nelson. In: Cantus Manuscript Database for Latin Ecclesiastical Chant: Inventories of Chant Sources. Directed by Debra Lacoste (2011-), Terence Bailey (1997-2010), and Ruth Steiner (1987-1996). Web developer, Jan Kolácek (2011-).