Columbia subject headings:
Harvard subject headings:
Germany--History--Congresses.
Germany--Kings and rulers--Congresses.
Germany--Relations--Great Britain--Congresses.
Great Britain--History--Congresses.
Great Britain--Kings and rulers--Congresses.
Great Britain--Relations--Germany--Congresses.
Royal houses--Germany--History--Congresses.
Royal houses--Great Britain--History--Congresses.
Princeton subject headings:
Germany--History--Congresses.
Germany--Kings and rulers--Congresses.
Germany--Relations--Great Britain--Congresses.
Great Britain--History--Congresses.
Great Britain--Kings and rulers--Congresses.
Great Britain--Relations--Germany--Congresses.
Royal houses--Germany--History--Congresses.
Royal houses--Great Britain--History--Congresses.