Columbia subject headings:
Harvard subject headings:
Dissenters--Germany (East)--Biography--Sources.
Espionage--Germany (East)--Archival resources.
Germany (East). Ministerium für Staatssicherheit--Records and correspondence.
Germany (East). Ministerium für Staatssicherheit.
Journalists--Germany (East)--Biography--Sources.
National security--Germany (East)--Records and correspondence.
Political activists--Germany (East)--Biography.
Secret service--Germany (East)--Records and correspondence.
Wulkau, Peter, 1947-
Princeton subject headings:
Germany (East)--Politics and government.
Germany (East). Ministerium für Staatssicherheit--Records and correspondence.
Informers--Germany (East).
Literature and state--Germany (East)--History--Sources.
Wulkau, Peter, 1947---Political activity.
Wulkau, Peter, 1947---Political and social views.