Columbia subject headings:
Harvard subject headings:
Europe--Economic conditions.
Europe--Social conditions.
Families--Europe--History.
Families--United States--History.
United States--Economic conditions.
United States--Social conditions.
Princeton subject headings:
Europe--Economic conditions.
Europe--Social conditions.
Families--Europe--History.
Families--United States--History.
United States--Economic conditions.
United States--Social conditions.