01469cam a2200385Ia 4500005951293MiAaHDL20250726000000.0m d cr bn ---auaua770609s1977 dcuabo f000 0 eng dAU@000002736741(MiU)990059512930106381sdr-miu.990059512930106381(MiU)MIU01000000000000005951293-goog(OCoLC)3027726(MiU)Aleph005951293GPOGPOOCLCQBOMRIUtOrBLWn-us-paBMRA637-AI 28.23:8230Moebs, Noel N.Roof rock structures and related roof support problems in the Pittsburgh coalbeds of southwestern Pennsylvania /by Noel N. Moebs.[Washington, D.C.] :Dept. of the Interior, Bureau of Mines,[1977][2], ii, 30 p. :ill., maps ;27 cm.texttxtrdacontentcomputercrdamediaonline resourcecrrdacarrierReport of investigations / Bureau of Mines ;8230Includes bibliographical references and appendix.Mode of access: Internet.Mine roof bolting.http://id.loc.gov/authorities/subjects/sh85085529Mine timbering.http://id.loc.gov/authorities/subjects/sh85085541CoalGeologyPennsylvaniaPittsburgh coalbed.3901507848234900595129320241217234416.020250726000000.020260224140649.02026-02-25T06:56:17Z2024-12-24T18:30:02ZSDR-MIUmiuALMAprepare.pl-004-009BKsdr-miu.990059512930106381MiUSDRGWLA005951293mdp.39015078482349MIU990059512930106381MIUGWLA20260225googlemdp.390150784823491977pdbibUS fed doc