Columbia subject headings:
Benefices, Ecclesiastical--History--To 1500--Sources.
Cardinals--Correspondence.
Catholic Church--Records and correspondence.
Catholic Church. Poenitentiaria Apostolica--History--Sources.
Patronage, Ecclesiastical--History--To 1500--Sources.
Penance--History--To 1500--Sources.
Penitentials--History--To 1500--Sources.
Penitents--Europe--Correspondence.
Harvard subject headings:
Catholic Church. Poenitentiaria Apostolica--History--Sources.
Princeton subject headings:
Benefices, Ecclesiastical--History--To 1500--Sources.
Cardinals--Correspondence.
Catholic Church--Records and correspondence.
Catholic Church. Poenitentiaria Apostolica--History--Sources.
Patronage, Ecclesiastical--History--To 1500--Sources.
Penance--History--To 1500--Sources.
Penitentials--History--To 1500--Sources.
Penitents--Europe--Correspondence.