Columbia subject headings:
World War, 1939-1945--Naval operations, British.
World War, 1939-1945--Transportation.
Harvard subject headings:
World War, 1939-1945--Naval operations, British.
World War, 1939-1945--Transportation.
Princeton subject headings:
Merchant marine--Great Britain.
Shipbuilding--Great Britain.
World War, 1939-1945--Naval operations, British.
World War, 1939-1945--Transportation.