Columbia subject headings:
Geological Society of America.
Geology--Abstracts.
Geology--Congresses.
Geology--United States--Congresses.
Harvard subject headings:
Geological Society of America.
Geology--Congresses
Geology--United States--Congresses.
Princeton subject headings:
Geological Society of America.
Geology--Congresses.
Geology--United States--Congresses.