00321nam a2200121Ia 4500008004100000040003800041100001500079245002300094250000600117260004500123300001400168653001700182211215s9999    xx            000 0 und d  cJayakar Knowledge Resource Centre  aLewis, R S 0aElements of mining  a3  bJohn Wiely and Sons, IncaNew Yorkc1964  axi,768 p.  aEngeeniring,