by New Zealand. Dept. of Labour

1895

by Great Britain. Ministry of Labour and National Service

1925

by South Africa. Department of labour

1928

by International Labour Office, International Labour Organization

1921

by Canada. Dept. of Labour

1904

by Canada. Department of Labour

1918

by New South Wales. Dept. of Labour and Industry and Social Services

1920

by International Labour Office

1920

by International Labour Office

1927

by Great Britain. Royal Commission on Labour

1892

by Great Britain. Ministry of Labour

1919

by Queensland. Dept. of Labour

1925