Columbia subject headings:
Harvard subject headings:
Conference papers and proceedings.
Europe--History--20th century.
Nobility--Europe--History--20th century--Congresses.
Nobility--Europe--Social life and customs--20th century--Congresses.
Princeton subject headings:
Aristocracy (Social class)--Europe--History--Congresses.
Elite (Social sciences)--Europe--History--20th century--Congresses.
Elite (Social sciences)--Europe--Social life and customs--20th century--Congresses.
Nobility--Europe--History--20th century--Congresses.
Nobility--Europe--History--Congresses.
Nobility--Europe--Social life and customs--20th century--Congresses.