Columbia subject headings:
Harvard subject headings:
Merchant marine--Italy--Liguria--History--19th century.
Shipbuilding--History--19th century.
Shipbuilding--Italy--Ligura--History--19th century.
Shipowners--Italy--Liguria--History--19th century.
Princeton subject headings:
Merchant marine--Italy--Liguria--History--19th century.
Shipbuilding--History--19th century.
Shipowners--Italy--Liguria--History--19th century.