Columbia subject headings:
Harvard subject headings:
Cryptography--Netherlands--History--20th century.
Espionage, Japanese--History--20th century.
Military intelligence--Netherlands--History--20th century.
Netherlands--Colonies--Asia--Defenses.
Netherlands--Colonies--Defenses--Asia.
World War, 1939-1945--Cryptography.
World War, 1939-1945--Military intelligence--Indonesia.
Princeton subject headings:
Cryptography--Netherlands--History--20th century.
Espionage, Japanese--History--20th century.
Military intelligence--Netherlands--History--20th century.
Netherlands--Colonies--Asia--Defenses.
World War, 1939-1945--Cryptography.
World War, 1939-1945--Military intelligence--Indonesia.