Columbia subject headings:
Harvard subject headings:
Aristocracy (Social class)--Germany--Rhineland--History--Sources--Congresses.
Aristocracy (Social class)--Germany--Westphalia--History--Sources--Congresses.
Nobility--Germany--Rhineland--Economic conditions--Congresses.
Nobility--Germany--Rhineland--Social life and customs--Congresses.
Nobility--Germany--Westphalia--Economic conditions--Congresses.
Nobility--Germany--Westphalia--Social life and customs--Congresses.
Princeton subject headings:
Nobility--Germany--Rhineland--History--16th century--Sources.
Nobility--Germany--Rhineland--History--17th century--Sources.
Nobility--Germany--Rhineland--History--18th century--Sources.