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- l31000028 contributor B12943514.
- l31000028 contributor B12943515.
- l31000028 created "1930.".
- l31000028 date "1930".
- l31000028 date "1930.".
- l31000028 dateCopyrighted "1930.".
- l31000028 extent "91, [1] p.".
- l31000028 issued "1930".
- l31000028 issued "1930.".
- l31000028 language "eng".
- l31000028 publisher "Geneva, International labour office,".
- l31000028 subject "331.8182233".
- l31000028 subject "Coal miners.".
- l31000028 subject "Coal mines and mining.".
- l31000028 subject "HD5119.M6 I5 1930b".
- l31000028 subject "Hours of labor.".
- l31000028 title "Hours of work in coal mines. Item II on the agenda.".
- l31000028 type "text".