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- catalog contributor b11131515.
- catalog contributor b11131516.
- catalog created "1939 [i.e. 1938]".
- catalog date "1939 [i.e. 1938]".
- catalog date "1939".
- catalog dateCopyrighted "1939 [i.e. 1938]".
- catalog extent "153 p.,".
- catalog issued "1939 [i.e. 1938]".
- catalog issued "1939".
- catalog language "eng".
- catalog publisher "Geneva, International Labour Office,".
- catalog subject "Coal mines and mining.".
- catalog subject "Hours of labor.".
- catalog title "Reduction of hours of work in coal mines Sixth item on the agenda.".
- catalog type "text".