In Nativitate Domini ad matutinum

Completely out of season, but here's something nice from Wikimedia Commons: scans of the "Monastic Night office for the Feast of the Nativity, from the Liber Responsorialis pro Festis I. Classis et Communi Sanctorum juxta Ritum Monasticum, Solesmes, 1895."

A sample is below; there are 7 images in total.