Columbia subject headings:
Harvard subject headings:
Great Britain. Royal Navy--History--World War, 1939-1945.
World War, 1939-1945--Military intelligence.
World War, 1939-1945--Naval operations, British.
Princeton subject headings:
Great Britain. Royal Navy
World War, 1939-1945--Campaigns--Africa, North.
World War, 1939-1945--Campaigns--France.
World War, 1939-1945--Naval operations, British.