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Leaf from a Missal with Two Historiated Initials: Initial P[er omnia saecula saeculorum] (A Priest Celebrates Mass) and Initial V[ere dignum et iustum est] (Ecclesia and Synagogue), c. 1300. France, Beauvais, late
The St. Gregory Hymnal and Catholic Choir Book. Singers' ed., Melody ed. 259.2. Per omnia saecula saeculorum. Amen. | Hymnary.org
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