Helmer, Paul The Mass of St. James : Solemn Mass for the Feast of the Passion of St. James of Compostela according to the Codex Calixtinus / Paul Helmer - Ottawa : The Institute of Mediaeval Music , c. 1988 - 252 p. : il. ; 29 - Musicological Studies . ISBN: 0-931902-58-4 Subjects--Topical Terms: Misa-Santiago, el Mayor, Santo Universal Decimal Class. No.: 264-68:235.3Santiago el Mayor=111