Columbia subject headings:
Harvard subject headings:
Social problems--Switzerland--History--20th century--Congresses.
Switzerland--Social policy--Congresses.
Welfare state--Switzerland--History--20th century--Congresses.
Princeton subject headings:
Social problems--Switzerland--History--20th century--Congresses.
Switzerland--Social policy--Congresses.
Welfare state--Switzerland--History--20th century--Congresses.