Columbia subject headings:
Harvard subject headings:
Elite (Social sciences)--Germany--History--19th century--Congresses.
Elite (Social sciences)--Germany--History--20th century--Congresses.
Elite (Social sciences)--History--19th century--Congresses.
Elite (Social sciences)--History--20th century--Congresses.
Princeton subject headings:
Elite (Social sciences)--Germany--Congresses.
Germany--Social conditions--Congresses.