Columbia subject headings:
Harvard subject headings:
Electronic surveillance--United States
Germany (East)--Foreign relations--United States.
Germany (East). Ministerium für Staatssicherheit.
Intelligence service--Germany (East)
Intelligence service--United States.
United States--Foreign relations--Germany (East)
United States. National Security Agency/Central Security Service.
Princeton subject headings:
Electronic surveillance--United States.
Germany (East)--Foreign relations--United States.
Germany (East). Ministerium für Staatssicherheit
Intelligence service--Germany (East)
Intelligence service--United States.
United States--Foreign relations--Germany (East).
United States. National Security Agency/Central Security Service