The two folios do not form the middle of a gathering. The section devoted to motets was followed by one reserved mainly for mass movements, judging by the contents of f. 1 and 2 respectively.
Concordances & Cognates:
BAR - Barcelona, Biblioteca de Catalunya, MS 853
IVR - Ivrea, Biblioteca Capitolare 115
LEI - Leiden, Universiteitsbibliotheek, Fragment B.P.L. 2515
PAD - Padua, Biblioteca Universitaria 658
PAR - Paris, Bibliothèque Nationale, fonds nouv. acq. français 23190 (olim Serrant Château, ducs de la Trémoïlle)
STR - Strasbourg, Bibliothèque Municipale (olim Bibliothèque de la Ville) 222 C. 22
TAR - Tarragona, Archivo Histórico Archidiocesano ss(2)