Differentiae are entered in-line, following each antiphon. They were originally indexed hierarchically by mode using an alpha-numeric code that indicates the last note of the differentia and a sequentially-applied number (e.g., A1, A2, G1, G2, etc.).
Lacoste, Debra. Inventory of London (Canada), University of Western Ontario - Music Library, M2150. In: Cantus: A 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-).
Images for differentia indexing provided by Brian MacMillan, Music Library, Western University.
Standardized manuscript tonary completed by Rebecca Shaw (Dalhousie University) on January 25, 2019. Edited by Jennifer Bain, Sister Ilaria Culshaw, Andrea Klassen, and Brayden Olson and (Dalhousie University) on August 8, 2019 and Rebecca Shaw on August 11, 2019.