Columbia subject headings:
Glaciers--Congresses.
Ice sheets--Congresses.
Ice--Composition--Congresses.
Paleoecology--Congresses.
Harvard subject headings:
Glaciers--Congresses.
Ice sheets--Congresses.
Ice--Composition--Congresses.
Paleoecology--Congresses
Princeton subject headings:
Glaciers--Congresses.
Ice sheets--Congresses.
Ice--Composition--Congresses.
Paleoecology--Congresses.