Columbia subject headings:
Diplomacy--History--16th century--Congresses.
Diplomacy--History--17th century--Congresses.
Diplomacy--History--To 1500--Congresses.
Europe--Foreign relations--Congresses.
Harvard subject headings:
Diplomacy--History--Congresses.
Europe--Foreign relations--Congresses.
Princeton subject headings:
Diplomacy--History--16th century--Congresses.
Diplomacy--History--17th century--Congresses.
Diplomacy--History--To 1500--Congresses.
Europe--Foreign relations--Congresses.