01023nam a2200277Ia 4500 87521 BIBL 20160527204129.0 790724s1979 dcua b f000 0 eng 79018531 (OCoLC)05333971 DLC DLC m.c. PUED TN23 .U43 no. 8416 TN288 622/.08 s 622/.26 I 28.23:8416 Tandanand, Sathit. cn 282427 Local Development of a mechanical roof breaker for ground control in longwall operations under massive roof by Sathit Tandanand. Washington Dept. of the Interior, Bureau of Mines 1979. 20 p. ill. 27 cm. Report of investigations - United States Department of the Interior, Bureau of mines 8416 Bibliography: p. 17-18. Ground control (Mining) 231246 Local Rock mechanics 270299 Local Report of investigations (United States. Bureau of Mines) 8416. 71159 71159 0 0 0 TN_23_000000000000000__U43_NO__8416_TN288 0 cil 368536 7 7 4 2016-05-27 138816 0 TN23 .U43 no. 8416 TN288 mq138816 2016-05-27 00:00:00 r:87521 z:NCC:L 6