Columbia subject headings:
Harvard subject headings:
Escapes--Germany (East)--History.
Germany (East)--Politics and government.
Germany (East). Ministerium für Staatssicherheit--History.
Military deserters--Germany (East)--History.
North Atlantic Treaty Organization--Armed Forces--Germany (East)
Soldiers--Germany (East)--Biography.
Princeton subject headings:
Defectors--Germany (East).
Defectors--United States.
North Atlantic Treaty Organization--Armed Forces--Germany--History--20th century.
Spies--Germany (East).
Spies--United States.