Columbia subject headings:
Eleutherian Mills Historical Library--Catalogs.
Manuscripts, American--Delaware--Greenville--Catalogs.
Middle Atlantic States--Economic conditions--Catalogs.
Harvard subject headings:
Eleutherian Mills Historical Library--Catalogs.
Manuscripts, American--Delaware--Greenville--Catalogs.
Middle Atlantic States--Economic conditions--Sources--Manuscripts--Catalogs.
Princeton subject headings:
Du Pont family--Archives--Catalogs.
Eleutherian Mills Historical Library--Catalogs.
Manuscripts--Delaware--Catalogs.
Middle Atlantic States--Economic conditions--Manuscripts--Catalogs.
Middle Atlantic States--Economic conditions--Sources--Bibliography--Catalogs.