Columbia subject headings:
Harvard subject headings:
Geology, Stratigraphic--Pleistocene--Guidebooks.
Glacial epoch--North America--Guidebooks.
Glacial landforms--North America--Guidebooks.
North America--Guidebooks
Princeton subject headings:
Geology, Stratigraphic--Pleistocene--Guidebooks.
Glacial epoch--North America--Guidebooks.
Glacial landforms--North America--Guidebooks.
Guidebooks.
North America--Guidebooks.