C031 - Hours of Work (Coal Mines) Convention, 1931 (No. 31)

C028 - Protection against Accidents (Dockers) Convention, 1929 (No. 28) C027 - Marking of Weight (Packages Transported by Vessels) Convention, 1929 (No. 27) C026 - Minimum Wage-Fixing Machinery Convention, 1928 (No. 26) C025 - Sickness Insurance (Agriculture) Convention, 1927 (No. 25)