Columbia subject headings:
United States. Central Intelligence Agency--History.
United States. Office of Strategic Services--History.
World War, 1939-1945--Secret service--United States.
Harvard subject headings:
United States. Central Intelligence Agency--History.
United States. Office of Strategic Services--History.
World War, 1939-1945--Secret service--United States.
Princeton subject headings:
United States. Central Intelligence Agency--History.
United States. Office of Strategic Services--History.
World War, 1939-1945--Secret service--United States.