Columbia subject headings:
Heidelberg (Germany)--Biography--Congresses.
Heidelberg (Germany)--Intellectual life--Congresses.
Harvard subject headings:
Princeton subject headings:
Heidelberg (Germany)--Intellectual life--20th century--Congresses.
Humanities--Germany--History--Congresses.
Learning and scholarship--Germany--Heidelberg--History--Congresses.
Social sciences--Germany--History--Congresses.
Universität Heidelberg--History--Congresses.