Columbia subject headings:
Harvard subject headings:
Europe--Social policy--Congresses.
Political participation--Europe--History--Congresses.
Social change--Europe--Congresses.
Social problems--Europe--History--Congresses.
Princeton subject headings:
Europe--Social policy--Congresses.
Political participation--Europe--History--Congresses.
Social change--Europe--Congresses.
Social problems--Europe--History--Congresses.