Columbia subject headings:
Missions--History--Middle Ages, 600-1500.
Preaching--History--Middle Ages, 600-1500.
Harvard subject headings:
Missions--Sermons
Preaching--History--Early church, ca. 30-600
Religious disputations.
Princeton subject headings:
Missions--History--Middle Ages, 600-1500.
Preaching--History--Middle Ages, 600-1500.
Sermons, Medieval--History and criticism.