Columbia subject headings:
Harvard subject headings:
Electronic surveillance--Germany.
Espionage--Germany--History--20th century.
Germany. Reichsluftfahrtministerium. Forschungsamt
Göring, Hermann, 1893-1946
Military intelligence--Germany--History--20th century.
Secret service--Germany--History--20th century.
Princeton subject headings:
Electronic surveillance--Germany.
Espionage--Germany--History--20th century.
Germany. Reichsluftfahrtministerium. Forschungsamt
Göring, Hermann, 1893-1946.
Military intelligence--Germany--History--20th century.
Secret service--Germany--History--20th century.