Columbia subject headings:
Harvard subject headings:
American Bottom (Ill.)--Antiquities.
Illinois--Antiquities--Congresses.
Indians of North America--Illinois--American Bottom--Antiquities--Congresses.
Indians of North America--Middle West--Antiquities--Congresses.
Middle West--Antiquities--Congresses.
Princeton subject headings:
American Bottom (Ill.)--Antiquities.
Illinois--Antiquities--Congresses.
Indians of North America--Illinois--American Bottom--Antiquities--Congresses.
Indians of North America--Middle West--Antiquities--Congresses.
Middle West--Antiquities--Congresses.