Paris / Tournai / Rome, Société de Saint Jean l'Évangéliste, Desclée, 1935, thick in-8°, frontispiece, xiv+660 pp, 154 ills., bibl., 10 indexes, 5 lg folding musical ills., sturdy green cloth binding, ex-library, with some labels and markings but still a fine/good copy. Paléographie grégorienne N° 709.