Columbia subject headings:
Estates (Social orders)--Germany--History--Congresses.
Social classes--Germany--History--Congresses.
Social mobility--Germany--History--Congresses.
Harvard subject headings:
Social classes--Europe--History--16th century--Congresses.
Social classes--Europe--History--17th century--Congresses.
Social history--16th century--Congresses.
Social history--17th century--Congresses.
Social mobility--Europe--History--16th century--Congresses.
Social mobility--Europe--History--17th century--Congresses.
Princeton subject headings:
Estates (Social orders)--Germany--History--Congresses.
Social classes--Germany--History--Congresses.
Social mobility--Germany--History--Congresses.