St. Gallen, Stiftsbibliothek, Cod. Sang. 376, p. 37 – Calendar, Computus, Tropary, Gradual, Sequentiary
http://www.e-codices.chen/sendPage/csg-0376_037/37

License:

Terms of Use:

http://www.e-codices.unifr.ch/en/about/terms