01218nam a2200289Ia 450000100060000000300050000600500170001100800410002801000150006903500200008404000190010404900090012305000310013208200230016308600170018610000420020324501280024526000620037330000240043549000950045950400280055465000430058265000340062583000690065999900170072895201830074587521BIBL20160527204129.0790724s1979    dcua     b   f000 0 eng    a 79018531   a(OCoLC)05333971  aDLCcDLCdm.c.  aPUED1 aTN23b.U43 no. 8416aTN288  a622/.08 sa622/.260 aI 28.23:841610aTandanand, Sathit.wcn92824272Local10aDevelopment of a mechanical roof breaker for ground control in longwall operations under massive roofcby Sathit Tandanand.0 aWashingtonbDept. of the Interior, Bureau of Minesc1979.  a20 p.bill.c27 cm.1 aReport of investigations - United States Department of the Interior, Bureau of minesv8416  aBibliography: p. 17-18. 0aGround control (Mining)92312462Local 0aRock mechanics92702992Local 0aReport of investigations (United States. Bureau of Mines)v8416.  c71159d71159  0010406TN_23_000000000000000__U43_NO__8416_TN288708cil9368536a7b7c4d2016-05-27i138816l0oTN23 .U43 no. 8416 TN288pmq138816r2016-05-27 00:00:00xr:87521 x z:NCC:Ly6