Columbia subject headings:
Shipbuilding--Great Britain.
Shipbuilding--United States.
Shipping.
World War, 1914-1918--Economic aspects.
Harvard subject headings:
Shipbuilding--Great Britain
Shipbuilding--United States
Shipping
World War, 1914-1918--Economic aspects
Princeton subject headings:
Shipbuilding--Great Britain.
Shipbuilding--United States.
Shipping.
World War, 1914-1918--Economic aspects.