Columbia subject headings:
Harvard subject headings:
Espionage--Germany--Hamburg--History--20th century--Exhibitions.
Germany (East). Ministerium für Staatssicherheit--History--Exhibitions.
Politicians--Germany--Hamburg--History--20th century--Exhibitions.
Spies--Germany (East)--History--20th century--Exhibitions.
Princeton subject headings:
Espionage--Germany--Hamburg--History--20th century--Exhibitions.
Germany (East). Ministerium für Staatssicherheit--History--Exhibitions.
Politicians--Germany--Hamburg--History--20th century--Exhibitions.
Spies--Germany (East)--History--20th century--Exhibitions.