Columbia subject headings:
Catholic Church--Education--Germany--History--Congresses.
Catholics--Germany--Intellectual life--Congresses.
Harvard subject headings:
Catholic Church--Education--Germany--History--Congresses.
Catholics--Germany--Intellectual life--Congresses.
Princeton subject headings:
Catholic Church--Education--Germany.
Catholic Church--Germany--19th century.
Catholic Church--Germany--20th century.
Religion and science.