Columbia subject headings:
Industries--Illinois--Sangamon County.
Industries--Illinois--Springfield.
Sangamon County (Ill.)--Description and travel.
Sangamon County (Ill.)--History.
Springfield (Ill.)--Description and travel.
Springfield (Ill.)--History.
Harvard subject headings:
Industries--Illinois--Sangamon County.
Industries--Illinois--Springfield.
Sangamon County (Ill.)--Description and travel.
Sangamon County (Ill.)--History.
Springfield (Ill.)--Description and travel.
Springfield (Ill.)--History.
Princeton subject headings: