Columbia subject headings:
Cave churches--Italy--Abruzzo.
Church architecture--Italy--Abruzzo.
Hermitages--Italy--Abruzzo.
Harvard subject headings:
Princeton subject headings:
Abruzzo (Italy)--Antiquities.
Abruzzo (Italy)--Church history.
Cave churches--Italy--Abruzzo.
Christian antiquities--Italy--Abruzzo.
Hermits--Italy--Abruzzo.