Columbia subject headings:
Canada. Royal Canadian Navy--History.
Technological innovations--Government policy--Canada.
World War, 1939-1945--Technology.
Harvard subject headings:
Canada. Royal Canadian Navy
World War, 1939-1945--Naval operations.
Princeton subject headings:
Canada. Royal Canadian Navy--History.
Technological innovations--Government policy--Canada.
World War, 1939-1945--Technology.