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- 29026672 contributor B741821.
- 29026672 contributor B741822.
- 29026672 created "1929.".
- 29026672 date "1929".
- 29026672 date "1929.".
- 29026672 dateCopyrighted "1929.".
- 29026672 extent "iv, 44 p.".
- 29026672 issued "1929".
- 29026672 issued "1929.".
- 29026672 language "eng".
- 29026672 publisher "Washington, U. S. Govt. print. off.,".
- 29026672 spatial "Pennsylvania.".
- 29026672 subject "Coal mines and mining Pennsylvania.".
- 29026672 subject "Mine timbering.".
- 29026672 subject "Strength of materials.".
- 29026672 subject "TN23 .U4 no. 303".
- 29026672 title "Tests of strength of roof supports used in anthracite mines of Pennsylvania.".
- 29026672 type "text".