Columbia subject headings:
Poor--Employment--Europe--History.
Poverty--Europe--History.
Wages--Europe--History.
Welfare state--Europe--History.
Working poor--Europe--History.
Harvard subject headings:
Poor--Employment--Europe--History.
Poverty--Europe--History.
Wages--Europe--History.
Welfare state--Europe--History.
Working poor--Europe--History.
Princeton subject headings: