Columbia subject headings:
Harvard subject headings:
Espionage--Germany (East)--Biography.
Germany (East). Ministerium für Staatssicherheit.
Kopp, Horst, 1933-
Secret service--Germany (East)--Biography.
Princeton subject headings:
Espionage--Germany (East)--Biography.
Germany (East). Ministerium für Staatssicherheit
Kopp, Horst, 1933-
Secret service--Germany (East)--Biography.