Columbia subject headings:
Harvard subject headings:
International Union of Mine, Mill, and Smelter Workers--History.
Mineral industries--Canada--Employees--History.
Mineral industries--Ontario--Sudbury Region--Employees--History.
Miners--Labor unions--Canada--History.
Miners--Labor unions--Ontario--Sudbury Region--History.
Princeton subject headings:
International Union of Mine, Mill, and Smelter Workers--History.
Mineral industries--Canada--Employees--History.
Mineral industries--Ontario--Sudbury Region--Employees--History.
Miners--Labor unions--Canada--History.
Miners--Labor unions--Ontario--Sudbury Region--History.