Columbia subject headings:
Luxembourg--History--Congresses.
Harvard subject headings:
Europe--History--476-1492--Congresses.
Holy Roman Empire--History--House of Luxemburg, 1308-1437--Congresses.
Princeton subject headings:
Europe--History--476-1492--Congresses.
Holy Roman Empire--History--House of Luxemburg, 1308-1437--Congresses.