Columbia subject headings:
Harvard subject headings:
Business and politics--Delaware--Wilmington--History--20th century.
E.I. du Pont de Nemours & Company
Wilmington (Del.)--Economic conditions.
Wilmington (Del.)--Politics and government.
Wilmington (Del.)--Social conditions.
Princeton subject headings:
Business and politics--Delaware--Wilmington--History--20th century.
E.I. du Pont de Nemours & Company.
Wilmington (Del.)--Economic conditions.
Wilmington (Del.)--Politics and government.
Wilmington (Del.)--Social conditions.