Columbia subject headings:
Harvard subject headings:
Espionage, East German--History.
Germany (East). Ministerium für Staatssicherheit--History.
Intelligence service--Germany (East)--History.
Police--Germany (West)--History.
Polizei Berlin--History.
Princeton subject headings:
Espionage, East German--History.
Germany (East). Ministerium für Staatssicherheit--History.
Intelligence service--Germany (East)--History.
Police--Germany (West)--History.
Polizei Berlin--History.