Columbia subject headings:
Elite (Social sciences)--Germany--History--18th century.
Elite (Social sciences)--Germany--History--19th century.
Germany--Social conditions--18th century.
Germany--Social conditions--19th century.
Harvard subject headings:
Elite (Social sciences)--Europe--History--Congresses.
Europe--Social conditions--Congresses.
Social classes--Europe--History--Congresses.
Upper class--Europe--History--Congresses.
Princeton subject headings:
Elite (Social sciences)--Europe--History--Congresses.
Europe--Social conditions--Congresses.
Social classes--Europe--History--Congresses.
Upper class--Europe--History--Congresses.