Columbia subject headings:
Harvard subject headings:
Industrial management--Employee participation--Congresses.
Industrial relations--Congresses
Labor unions--Congresses
Workers' International Relief--Congresses.
Works councils--Congresses.
Princeton subject headings:
Industrial management--Employee participation--Congresses.
Industrial relations--Congresses.
Labor unions--Congresses.
Workers' International Relief--Congresses.
Works councils--Congresses.