Columbia subject headings:
Earth (Planet)--Crust--Congresses.
Geology, Stratigraphic--Precambrian--Congresses.
Geology--North Atlantic Region--Congresses.
Harvard subject headings:
Earth (Planet)--Crust--Congresses.
Geology, Stratigraphic--Precambrian--Congresses
Geology--North Atlantic Ocean Region--Congresses.
Geology--North Atlantic Region--Congresses.
Princeton subject headings:
Earth--Crust--Congresses.
Geology, Stratigraphic--Precambrian--Congresses.
Geology--North Atlantic Ocean Region--Congresses.