00346nam a22001217a 450000500170000000800410001702000180005804100080007608200170008410000180010124500630011926000420018220260601101320.0260601b        |||||||| |||| 00| 0 eng d  a0-04-622005-4  aeng  a622.2bBRA/R  aBrady, B.H.G.  aRock MechanicsbFor Underground Miningc/ by B.H.G. Brady   aLondon:bGeorge Allen & Unwin;c1985.