Columbia subject headings:
Imperina Valley (Italy)--History.
Mineral industries--Italy--Imperina Valley--History.
Miners--Italy--Imperina Valley--History.
Miners--Italy--Imperina Valley--Interviews.
Harvard subject headings:
Princeton subject headings:
Imperina Valley (Italy)--History.
Interviews.
Mineral industries--Italy--Imperina Valley--History.
Miners--Italy--Imperina Valley--History.
Miners--Italy--Imperina Valley--Interviews.