Here the choir book of the Officium natalis Christi. The voices Cantus, Altus, Tenor Quintus & Bassus are numbered 1–5, with 1 being the highest voice. These notes are good for printing.
It is best to have two pages on one sheet of paper in landscape format, so that the cantus part (1) and mostly the bass (5) come to the left, as in the choir book.