TR  / IC-7623 <br/>
L. W. Kelly <br/>
       Economic benefits of systemic roof bolting in zeigler no.3 mine,bell & zoller coal and mining Co. 
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<br><U>Copy Details:</u><br> Acc. No.: <b>TR5260</b>, Full Call No.: TR IC-7623,   Item type:  Technical Report , Location: General Stacks, <br><b>------------------------- --------------------- ------ --------- ------- ------- --------- -------- </b><br>