by Canada. Department of Labour

1921

by Canada. Parliament. House of Commons

1905

by Canada. Trades and labor congress

1919

by Canada. Department of Agriculture

1918

by Canada. Commission of Conservation

1912

by Canada. Department of Labour

1921

by Canada

1919

by Canada. Mines Branch, Lionel Heber Cole

1930 · F.A. Acland

by Canada. Mines Branch (1950- )

1924

by Canada. Department of Labour

1921

by Canada

1921

by Canada. Department of Labour

1919