Columbia subject headings:
Harvard subject headings:
Abruzzo (Italy)--Religious life and customs.
Cave churches--Italy--Abruzzo.
Christian pilgrims and pilgrimages--Italy--Abruzzo.
Church buildings--Italy--Abruzzo.
Princeton subject headings:
Abruzzo (Italy)--Religious life and customs.
Cave churches--Italy--Abruzzo.
Christian pilgrims and pilgrimages--Italy--Abruzzo.
Church buildings--Italy--Abruzzo.