Columbia subject headings:
Harvard subject headings:
Hours of labor--Congresses.
Labor--Societies, etc.--Congresses.
Work and family--Congresses.
Work--Congresses
Work--Social aspects--Congresses.
Princeton subject headings:
Hours of labor--Congresses.
Labor--Societies, etc.--Congresses.
Work and family--Congresses.
Work--Congresses.
Work--Social aspects--Congresses.