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- l51000030 contributor B12944634.
- l51000030 contributor B12944635.
- l51000030 created "1951".
- l51000030 date "1951".
- l51000030 dateCopyrighted "1951".
- l51000030 extent "vi, 177 p.".
- l51000030 issued "1951".
- l51000030 language "eng".
- l51000030 publisher "Geneva n.p.".
- l51000030 subject "Coal miners.".
- l51000030 subject "Coal mines and mining.".
- l51000030 subject "Labor productivity.".
- l51000030 subject "TN803 .I73".
- l51000030 title "Productivity in coal mines. Third item on the adgenda.".
- l51000030 type "text".