Columbia subject headings:
Art--Italy.
Italy--Antiquities.
Italy--Description and travel.
Harvard subject headings:
Art--Italy.
Italy--Antiquities.
Italy--Description and travel.
Phlegraean Plain (Italy)
Princeton subject headings:
Art--Italy.
Italy--Antiquities.
Italy--Description and travel.
Phlegraean Plain (Italy)
Phlegræan Plain.