Columbia subject headings:
Harvard subject headings:
Germany--Commerce--History--16th century--Congresses.
Germany--Commerce--History--17th century--Congresses.
Germany--Economic conditions--Congresses.
Germany--Social conditions--Congresses.
Poland--Commerce--History--16th century--Congresses.
Poland--Commerce--History--17th century--Congresses.
Poland--Economic conditions--Congresses.
Poland--Social conditions--Congresses.
Princeton subject headings:
Germany--Social conditions--Congresses.
Poland--Social conditions--Congresses.
Social classes--Germany--History--Congresses.
Social classes--Poland--History--Congresses.