Columbia subject headings:
Harvard subject headings:
Germany--Intellectual life--20th century--Congresses.
Research--Germany--History--20th century--Congresses.
Science and state--Germany--History--20th century--Congresses.
Science--Germany--History--20th century--Congresses.
Princeton subject headings:
Germany--Intellectual life--20th century--Congresses.
Research--Germany--History--20th century--Congresses.
Science and state--Germany--History--20th century--Congresses.
Science--Germany--History--20th century--Congresses.