Columbia subject headings:
Geology, Stratigraphic--Quaternary--Periodicals.
Glacial epoch--Periodicals.
Harvard subject headings:
Geology, Stratigraphic--Quaternary--Periodicals
Glacial epoch--Periodicals.
Princeton subject headings:
Geology, Stratigraphic--Quaternary--Periodicals.
Geology--Periodicals.
Glacial epoch--Periodicals.
Periodicals.