Columbia subject headings:
Catacombs.
Catholic Church--Government.
Catholic Church--Liturgy.
Church buildings--Italy--Rome.
Monasticism and religious orders.
Popes.
Harvard subject headings:
Catacombs
Catholic Church--Government.
Catholic Church--Liturgy.
Church buildings--Italy--Rome.
Monasticism and religious orders
Popes
Rome (Italy)--Churches.
Princeton subject headings:
Catacombs.
Catholic Church--Government.
Catholic Church--Liturgy.
Monasticism and religious orders.
Popes.
Rome (Italy)--Churches.