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2 rectangular cuttings containing initial letters, from a choir book having chant on a red 4-line staff: (1) the letter "C"; (2) the letters "M" and "P".
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Cambridge, MA, Harvard University, Houghton Library, MS Typ 978, (seq. 3) – Gradual or antiphonary — https://fragmentarium.ms/view/page/F-dhfu/1162/16187