Columbia subject headings:
Indians of North America.
Mississippi River Valley--History.
Mound-builders.
Northwest, Old--History.
Harvard subject headings:
Indians of North America.
Mississippi River Valley.
Mound-builders.
Northwest, Old--History.
Northwestern States--History.
Princeton subject headings:
Indians of North America.
Mississippi River Valley--History.
Mound-builders.
Northwest, Old--History.