Columbia subject headings:
Geology, Stratigraphic--Holocene.
Paleobotany--Holocene.
Paleobotany--North America.
Pollen, Fossil.
Sediments (Geology)--North America.
Harvard subject headings:
Paleobotany--North America.
Paleobotany--Quaternary
Palynology--Quaternary.
Pollen, Fossil--North America.
Pollen, Fossil.
Princeton subject headings:
Paleobotany--North America.
Paleobotany--Quaternary.
Pollen, Fossil.