Columbia subject headings:
Nickel industry--Ontario--Sudbury.
Sudbury (Greater Sudbury, Ont.)--History.
Harvard subject headings:
Nickel industry--Ontario--Sudbury.
Sudbury (Greater Sudbury, Ont.)--History.
Princeton subject headings:
Nickel industry--Ontario--Sudbury.
Sudbury (Greater Sudbury, Ont.)--History.