Columbia subject headings:
Paleoclimatology--Congresses.
Paleogeography--Congresses.
Petroleum--Geology--Congresses.
Harvard subject headings:
Paleoclimatology--Congresses
Paleogeography--Congresses.
Petroleum--Geology--Congresses
Princeton subject headings:
Paleoclimatology--Congresses.
Paleogeography--Congresses.
Petroleum--Geology--Congresses.