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- 32028099 alternative "Roof of Pittsburgh coal bed, Pittsburgh district.".
- 32028099 contributor B802545.
- 32028099 contributor B802546.
- 32028099 created "1932.".
- 32028099 date "1932".
- 32028099 date "1932.".
- 32028099 dateCopyrighted "1932.".
- 32028099 extent "iv, 98 p.".
- 32028099 issued "1932".
- 32028099 issued "1932.".
- 32028099 language "eng".
- 32028099 publisher "Washington, U.S. Govt. print. off.,".
- 32028099 spatial "Pennsylvania.".
- 32028099 subject "Coal mines and mining Pennsylvania.".
- 32028099 subject "Mine timbering.".
- 32028099 subject "TN1 .U6 no. 541".
- 32028099 title "A study of mine roof of the Pittsburgh and coal bed in the Pittsburgh mining district,".
- 32028099 type "text".