Columbia subject headings:
Harvard subject headings:
Chemical industry--United States--History
Du Pont family.
E.I. du Pont de Nemours & Company--History.
United States--Economic conditions.
United States--Social conditions.
Princeton subject headings:
Chemical industry--United States--History.
Du Pont family.
E.I. du Pont de Nemours & Company--History.
United States--Economic conditions.
United States--Social conditions.