Columbia subject headings:
Hungary--Economic conditions--Congresses.
Hungary--History--Congresses.
Hungary--Social conditions--Congresses.
Poland--Economic conditions--Congresses.
Poland--History--To 1795--Congresses.
Poland--Social conditions--Congresses.
Harvard subject headings:
Hungary--Economic conditions--Congresses.
Hungary--History--Congresses.
Hungary--Social conditions--Congresses.
Poland--Economic conditions--Congresses.
Poland--History--To 1795--Congresses.
Poland--Social conditions--Congresses.
Princeton subject headings:
Hungary--Economic conditions--Congresses.
Hungary--History--Congresses.
Hungary--Social conditions--Congresses.
Poland--Economic conditions--Congresses.
Poland--History--To 1795--Congresses.
Poland--Social conditions--Congresses.