Columbia subject headings:
Harvard subject headings:
Midget submarines--History.
World War, 1939-1945--Campaigns--Pacific Ocean.
World War, 1939-1945--Naval operations, Japanese.
World War, 1939-1945--Naval operations--Submarine.
Princeton subject headings:
Midget submarines--History.
World War, 1939-1945--Naval operations, Japanese.
World War, 1939-1945--Naval operations--Submarine.