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- 31026178 contributor B779388.
- 31026178 contributor B779389.
- 31026178 created "1930.".
- 31026178 date "1930".
- 31026178 date "1930.".
- 31026178 dateCopyrighted "1930.".
- 31026178 extent "iv, 41 p.".
- 31026178 issued "1930".
- 31026178 issued "1930.".
- 31026178 language "eng".
- 31026178 publisher "Washington, U.S. Govt. print. off.,".
- 31026178 spatial "Ohio.".
- 31026178 spatial "Pennsylvania.".
- 31026178 spatial "West Virginia.".
- 31026178 subject "Coal mines and mining Ohio.".
- 31026178 subject "Coal mines and mining Pennsylvania.".
- 31026178 subject "Coal mines and mining West Virginia.".
- 31026178 subject "Mine timbering.".
- 31026178 subject "TN1 .U6 no. 485".
- 31026178 title "Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio,".
- 31026178 type "text".