Columbia subject headings:
Maps.
Petrology--Italy--Phlegraean Plain--Maps.
Volcanoes--Italy--Phlegraean Plain--Maps.
Harvard subject headings:
Geology, Stratigraphic--Quaternary
Geology--Italy--Phlegraean Plain.
Petrology--Italy--Phlegraean Plain--Maps.
Volcanic hazard analysis--Italy--Phlegraean Plain.
Volcanism--Italy--Phlegraean Plain--Maps.
Volcanism--Italy--Phlegraean Plain.
Princeton subject headings:
Petrology--Italy, Central--Maps.
Petrology--Italy, Central.
Volcanoes--Italy, Central--Maps.
Volcanoes--Italy, Central.