The differentiae of each mode have been numbered with a two-digit system: an upper-case letter indicating the final pitch of the differentia and a sequentially ordered numeral. Differentiae that vary in terms only of immediately repeated notes, presence/absence of liquesence or neumation are give the same differentia code, but are distinguished with a lowercase letter in the first column of the “Extra” field .
The codes for differentiae and chants not found in CAO in this index are consistent with those used for the other Franciscan manuscripts in the database:
Assisi, Biblioteca comunale, 693
Assisi, Biblioteca comunale, 694
Budapest, Egyetemi Könyvtár (University Library), lat. 118, 119, 122, 121
Chicago, Newberry Library, 24
Città del Vaticano (Roma), Biblioteca Apostolica Vaticana, lat. 8737
Fribourg (Switzerland), Bibliothèèque des Cordeliers, 2
München, Bayersiche Staatsbibliothek, 12o Cmm 1 (St. Anna Kloster)
Napoli, Biblioteca nazionale Vittorio Emanuele III, vi. E. 20
- Miskuly, Jason M. “Julian of Speyer: Life of St. Francis.” Franciscan Studies 49 (1989): 93-115.
- Mitchell, Andrew W. “The Chant of the Earliest Franciscan Liturgy.” Ph.D. diss., The Unversity of Western Ontario, 2003.
- Ziino, Agostino. “Liturgia e musica francescana nei secoli XIII-XIV.” In Francesco d’Assisi: Storia e arte, 127-58. Milan: Electa, 1982.