Columbia subject headings:
Canadian Shield--Congresses.
Geology, Stratigraphic--Precambrian--Congresses.
Geology--Ontario--Congresses.
Harvard subject headings:
Geology, Stratigraphic--Precambrian
Geology, Stratigraphic--Precambrian--Congresses
Geology--Canadian Shield--Congresses.
Geology--Newfoundland and Labrador.
Geology--Québec (Province)
Princeton subject headings: