Columbia subject headings:
Leisure--Germany (West)
Working class--Germany (West)
Working class--Germany (West)--Social conditions.
Harvard subject headings:
Leisure--Germany (West)
Working class--Germany (West)
Working class--Germany (West)--Social conditions.
Princeton subject headings:
Leisure--Germany (West)
Working class--Germany (West)
Working class--Germany (West)--Social conditions.