Columbia subject headings:
Religious literature, German--History and criticism--Congresses.
Theological libraries--Germany--Cologne--History--Congresses.
Universitäts- und Stadtbibliothek Köln. Evangelische Bibliothek--History--Congresses.
Harvard subject headings:
Religious literature, German--Germany--Cologne--History and criticism--Congresses.
Theological libraries--Germany--Cologne--History--Congresses.
Universitäts- und Stadtbibliothek Köln--History--Congresses.
Princeton subject headings: