01914cam a2200397Ka 4500006867135MiAaHDL20250726000000.0m d cr bn ---auaua830325s1932 dcuabk 000 0 eng 32028099 AU@000028179658(MiU)990068671350106381sdr-miu.990068671350106381(MiU)MIU01000000000000006867135-goog(OCoLC)29109483(MiU)Aleph006867135DLCMNUOCLLHLUSBMNUtOrBLWn-us-paUSBMC 22.5:541Paul, J. W.(James Washington)http://id.loc.gov/authorities/names/nr2003013920http://id.loc.gov/rwo/agents/nr2003013920http://viaf.org/viaf/227153556http://isni.org/isni/0000000362556859A study of mine roof of the Pittsburgh coal bed in the Pittsburgh mining district /by J.W. Paul and L.N. Plein.Washington :U.S. Bureau of Mines,1932.iv, 98 p. :illus., map, tables, forms ;23 cm.texttxtrdacontentcomputercrdamediaonline resourcecrrdacarrierTechnical paper / United States. Bureau of Mines ;541Mode of access: Internet.Coal mines and miningPennsylvania.http://id.loc.gov/authorities/subjects/sh2009120495Mine timbering.http://id.loc.gov/authorities/subjects/sh85085541Plein, Leopold Nicholas,1897-author.http://id.loc.gov/authorities/names/no2024050340http://id.loc.gov/rwo/agents/no2024050340http://viaf.org/viaf/28171591140403230458United States.Bureau of Mines.http://id.loc.gov/authorities/names/n79063444http://id.loc.gov/rwo/agents/n79063444Roof of Pittsburgh coal bed, Pittsburgh district.3901507756562300686713520241218022643.020250726000000.020260303165447.02026-03-04T11:33:30Z2026-03-01T18:30:03ZSDR-MIUmiuALMAprepare.pl-004-009BKsdr-miu.990068671350106381MiUSDRGWLA006867135mdp.39015077565623MIU990068671350106381MIUGWLA20260304googlemdp.390150775656231932pdren