Columbia subject headings:
Harvard subject headings:
Aristocracy (Social class)--Germany, Southern--History--Congresses.
Oligarchy--Germany--History--Congresses.
Social classes--Germany, Southern--History--Congresses.
Princeton subject headings:
Aristocracy (Social class)--Germany, Southern--History--Congresses.
Oligarchy--Germany--History--Congresses.
Social classes--Germany, Southern--History--Congresses.