Columbia subject headings:
Industries--Social aspects--United States--History.
Social values.
United States--Economic conditions.
United States--Social conditions.
Harvard subject headings:
Industries--Social aspects--United States--History.
Social values.
United States--Economic conditions.
United States--Social conditions.
Princeton subject headings:
Industries--Social aspects--United States--History.
Social values.
United States--Economic conditions.
United States--Social conditions.