00900cam a22002297a 4500001000600000003000600006005001700012008004100029020001500070082001500085111009300100245019900193260005700392300003200449490002000481500002000501504002500521650003400546650002800580700002900608700003300637u4824SIRSI20250825175016.0230912s1979    xxua    r     101 0 eng d  a087930108204a622.332222 aInternational Symposium on Stability in Coal Miningn(1st. :d1978 :cVancouver, Canada)10aStability in coal mining :bProceedings of the First International Smposium on Stability in Coal Mining Vancouver, British Columbia, Canada 1978 /cedited by C. O. Brawner and Ian P. F. Dorling.  aSan Francisco :bMiller Freeman Publications,c1979.  a496 pages :billustrations.0 aWorld Coal Book  aIncludes index.  aReference: page 490. 7aMinas de carbónvCongresos.  aCoal minesvCongresses.1 aBrawner, C. O.,eeditor.1 aDorling, Ian P. F.,eeditor.