Columbia subject headings:
Harvard subject headings:
Deutsche Forschungsgemeinschaft--History--20th century--Congresses.
Physics--Political aspects--Germany--History--20th century--Congresses.
Physics--Political aspects--History--20th century--Congresses.
Physics--Research--Germany--History--20th century--Congresses.
Physics--Research--History--20th century--Congresses.
Princeton subject headings:
Physics--Research--Germany--History--20th century.
Research--Germany--History--20th century.
Research--Political aspects--Germany--History--20th century.
Science and state--Germany--History--20th century.
Science and state--History--20th century.