Columbia subject headings:
Harvard subject headings:
College teachers--Germany--Halle an der Saale--Societies, etc.
Germany (East). Ministerium für Staatssicherheit.
Germany--Intellectual life--20th century.
Martin-Luther-Universität Halle-Wittenberg--History.
Spirituskreis (Universität Halle-Wittenberg)--History.
Princeton subject headings:
Germany--Intellectual life--20th century.
Spirituskreis (Universität Halle-Wittenberg)