Columbia subject headings:
Harvard subject headings:
Building stones--Italy--Euganean Hills.
Quarries and quarrying--Italy--Euganean Hills--History.
Trachyte--Italy--Euganean Hills.
Princeton subject headings:
Mineral industries--Italy--Euganean Hills--History--Sources.
Mineral industries--Italy--Euganean Hills--History.
Mines and mineral resources--Italy--Euganean Hills--History--Sources.
Mines and mineral resources--Italy--Euganean Hills--History.