Columbia subject headings:
Harvard subject headings:
Ferdinand VI, King of Spain, 1713-1759--Congresses.
Spain--Civilization--18th century--Congresses.
Spain--History--Ferdinand VI, 1746-1759--Congresses.
Princeton subject headings:
Eighteenth century--Congresses.
Spain--Civilization--18th century--Congresses.
Spanish literature--18th century--History and criticism--Congresses.