Columbia subject headings:
Harvard subject headings:
Cave monasteries--Italy--Otranto.
Monastero di S. Nicola di Casole (Otranto, Italy)
Monasticism and religious orders--Italy--Otranto--History.
Otranto (Italy)--Church history.
Princeton subject headings:
Cave monasteries--Italy--Otranto.
Monastero di S. Nicola di Casole (Otranto, Italy)
Monasticism and religious orders--Italy--Otranto--History.
Otranto (Italy)--Church history.