Columbia subject headings:
Paleobotany--Eocene.
Palynology--Russia (Federation)--Indigirka River Valley.
Palynology--Russia (Federation)--Yana River Valley.
Harvard subject headings:
Princeton subject headings:
Paleobotany--Eocene.
Palynology--Russia (Federation)--Indigirka River Valley.
Palynology--Russia (Federation)--Yana River Valley.