Columbia subject headings:
Harvard subject headings:
Canada--Armed Forces--History--World War, 1939-1945.
World War, 1939-1945--Campaigns--Atlantic Ocean.
World War, 1939-1945--Naval operations, Canadian.
Princeton subject headings:
Canada--Armed Forces--History--World War, 1939-1945.
World War, 1939-1945--Campaigns--Atlantic Ocean.
World War, 1939-1945--Naval operations, Canadian.