Columbia subject headings:
Abandoned mines--Remodeling for other use--Italy--Caserta--Case studies.
Abandoned mines--Remodeling for other use--Italy--Naples--Case studies.
Abandoned mines--Remodeling for other use--Italy--Salerno--Case studies.
Harvard subject headings:
Abandoned mines--Remodeling for other use--Italy--Caserta--Case studies.
Abandoned mines--Remodeling for other use--Italy--Naples--Case studies.
Abandoned mines--Remodeling for other use--Italy--Salerno--Case studies.
Underground architecture.
Princeton subject headings: