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