Columbia subject headings:
Continental margins--Congresses.
Plate tectonics--Congresses.
Sea-floor spreading--Congresses.
Harvard subject headings:
Continental margins--Congresses.
Continental shelf--Congresses.
Earth (Planet)--Crust--Congresses.
Princeton subject headings:
Continental margins--Congresses.
Plate tectonics--Congresses.
Sea-floor spreading--Congresses.