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SUBJECTS (1-2 of 2)
Spying
1 -- See Espionage

--subdivision Secret service under names of wars, etc., e.g. World War, 1939-1945--Secret service; United States--History--Civil War, 1861-1865--Secret service
2 -- See Spies

--subdivisions Secret service and Underground movements under individual wars, e.g. World War, 1939-1945--Secret service; World War, 1939-1945--Underground movements
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