Columbia subject headings:
Cargo ships--Italy--Genoa--History.
Genoa (Italy)--Commerce--History.
Genoa (Italy)--History--To 1339.
Merchant marine--Italy--Genoa--History.
Shipping--Italy--Genoa--History.
Harvard subject headings:
Genoa (Italy)--Commerce--History.
Shipping--Italy--Genoa--History.
Ships--Italy--Genoa.
Princeton subject headings:
Genoa (Italy)--Commerce--History.
Shipping--Italy--Genoa--Sources.
Ships--Italy--Genoa--Sources.