A single leaf containing the beginning of the hymn "Duo chori modulantes sint sonori nuntiantes verba sapientiae", rubricated as the sequence hymn for mass for the feast of the Conversion of St. Paul (r-v).
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Cambridge, MA, Harvard University, Houghton Library, MS Typ 1004, (seq. 1) – Gradual, Dominican use
https://fragmentarium.ms/view/page/F-z6z1