STUDI GREGORIANI - POPE GREGORY VII (GREGORY THE GREAT) - 1947 6v set, Latin
STUDI GREGORIANI PER LA STORIA DI GREGORIO VII E DELLA RIFORMA GREGORIANA: Vols. Text in Latin. Classic hiostory of Pope Gregory the Greatr and his reforms. Set of Vols. 1-7 published from 1947-1961.