01426cam a2200385 a 4500005950932MiAaHDL20250726000000.0m d cr bn ---auaua870827s1987 paua f000 0 eng 87600351 (MiU)990059509320106381sdr-miu.990059509320106381(MiU)MIU01000000000000005950932-goog(OCoLC)16682663(MiU)Aleph005950932DLCDLCGPOBTCTABOMRIUtOrBLWBMRA637-A (MF)I 28.23:9148Leakage and performance characteristics of large stoppings for room-and-pillar mining /by Edward D. Thimons [and others].Pittsburgh, Pa. :U.S. Dept. of the Interior, Bureau of Mines,1987.17 p. :ill. ;28 cm.texttxtrdacontentcomputercrdamediaonline resourcecrrdacarrierReport of investigations / United States Department of the Interior, Bureau of Mines ;9148Bibliography: p. 17.Mode of access: Internet.Concrete stoppings (Mining)Airtightness.http://id.loc.gov/authorities/subjects/sh85030745Agapito, Joseph F. T.Adam, Marvin E.Brechtel, Carl E.Thimons, Edward D.3901507847927900595093220241217230113.020250726000000.020260304140655.02026-03-05T07:54:50Z2024-12-24T18:30:02ZSDR-MIUmiuALMAprepare.pl-004-009BKsdr-miu.990059509320106381MiUSDRGWLA005950932mdp.39015078479279MIU990059509320106381MIUGWLA20260305googlemdp.390150784792791987pdbibUS fed doc