https://www.ccwatershed.org/2013/03/19/1910-organum-comitans-ad-kyriale/
1910 (Anglican) Organum Comitans ad Kyriale
Jan 1, 2020 - A free PDF download of this entire book is provided, courtesy of the St. Jean de Lalande Library of Rare Books.
anglicanorganumcomitanskyriale