Columbia subject headings:
World War, 1939-1945--Cryptography.
World War, 1939-1945--Military intelligence--Japan.
World War, 1939-1945--Military intelligence.
Harvard subject headings:
World War, 1939-1945--Cryptography.
World War, 1939-1945--Military intelligence--Japan.
World War, 1939-1945--Military intelligence.
Princeton subject headings:
World War, 1939-1945--Cryptography.
World War, 1939-1945--Military intelligence--Japan.
World War, 1939-1945--Military intelligence.