A Computus, Breviary, Gradual and Sacramentary written in the XI Century at St. Gallen, Switzerland.
A collection of liturgical materials, containing computational texts and tables, a breviary with incipits of the spoken and chanted texts for the Mass for the principal feast days of Saints, a gradual with neumes and a sacramentary. Illustrated with several miniatures, executed in the monastery of St. Gall around 850.