Columbia subject headings:
Denmark--Civilization--18th century--Congresses.
Nobility--Denmark--History--18th century--Congresses.
Nobility--Germany--Schleswig-Holstein--History--18th century--Congresses.
Schleswig-Holstein (Germany)--Civilization--18th century--Congresses.
Harvard subject headings:
Denmark--Civilization--18th century--Congresses.
Nobility--Denmark--History--18th century--Congresses.
Nobility--Germany--Schleswig-Holstein--History--18th century--Congresses.
Schleswig-Holstein (Germany)--Civilization--18th century--Congresses.
Princeton subject headings:
Denmark--Civilization.
Denmark--Social life and customs.
Nobility--Denmark--History--18th century.
Nobility--Germany--Schleswig-Holstein--History.
Schleswig-Holstein (Germany)--Civilization.
Schleswig-Holstein (Germany)--Social life and customs.