Columbia subject headings:
Indians of North America--Illinois--Union County--Antiquities.
Union County (Ill.)--Antiquities.
Harvard subject headings:
Illinois--Antiquities.
Indians of North America--Illinois--Iron Mountain Region--Antiquities.
Indians of North America--Illinois--Union County--Antiquities.
Indians of North America--Implements--Illinois--Iron Mountain Region.
Iron Mountain Region (Ill.)--Antiquities.
Stone implements--Illinois--Iron Mountain Region.
Stone implements--Illinois--Union County--Analysis.
Union County (Ill.)--Antiquities.
Princeton subject headings:
Illinois--Antiquities.
Indians of North America--Illinois--Iron Mountain Region--Antiquities.
Indians of North America--Illinois--Iron Mountain Region--Implements.
Iron Mountain Region (Ill.)--Antiquities.
Stone implements--Illinois--Iron Mountain Region.