Columbia subject headings:
Harvard subject headings:
Geology, Stratigraphic--Holocene
Geology, Stratigraphic--Pleistocene
Geology--Illinois--Napoleon Hollow Site.
Prehistoric peoples--Illinois--Napoleon Hollow Site.
Princeton subject headings:
Geology, Stratigraphic--Holocene.
Geology, Stratigraphic--Pleistocene.
Geology--Illinois--Napoleon Hollow Site.
Prehistoric peoples--Illinois--Napoleon Hollow Site.