Columbia subject headings:
Espionage, American--Germany.
Germany--History--Sources.
United States. Office of Strategic Services. Research and Analysis Branch.
World War, 1939-1945--Secret service--Germany.
World War, 1939-1945--Secret service--United States.
Harvard subject headings:
Secret service--Germany
Secret service--United States
United States. Office of Strategic Services. Research and Analysis Branch.
World War, 1939-1945--Secret service--Germany.
World War, 1939-1945--Secret service--United States.
Princeton subject headings:
Espionage, American--Germany.
Germany--History--Sources.
United States. Office of Strategic Services. Research and Analysis Branch
World War, 1939-1945--Secret service--Germany.
World War, 1939-1945--Secret service--United States.