Columbia subject headings:
Harvard subject headings:
Education, Higher--Austria--History--20th century--Congresses.
Education, Higher--Germany--History--20th century--Congresses.
Education, Higher--Switzerland--History--20th century--Congresses.
Universities and colleges--Austria--History--20th century--Congresses.
Universities and colleges--Germany--History--20th century--Congresses.
Universities and colleges--Switzerland--History--20th century--Congresses.
Princeton subject headings:
Johannes Gutenberg-Universität--History--Congresses.