Columbia subject headings:
Continental drift--Congresses.
Earth (Planet)--Crust--Congresses.
Paleomagnetism--Congresses.
Harvard subject headings:
Continental drift--Congresses.
Earth (Planet)--Crust--Congresses.
Paleomagnetism--Congresses.
Princeton subject headings:
Continental drift--Congresses.
Earth (Planet)--Crust--Congresses.
Paleomagnetism--Congresses.