by International Labour Organization

1922

by International Management Institute

1928

by International Labour Office

1925

by International Labour Office

1927

by International Labour Office

1920

by League of Nations. International Committee on Intellectual Co-operation

1922

by International Labour Office

1924

by International Federation of Trade Unions

1924

by International Labour Organization

1924

by International Labour Office

1923

by International Labour Office. Governing Body. Session

1920

by International Association for Labor Legislation

1909