Gregory Cedric E. <br/><br/>
Rudiments of mining practice / 
Gregory Cedric E. 
 - Clausthal-Zellerfeld :  Trans Tech Publications,  1983. 
 - 141,[2]s. : il.,rys. ;  24cm. 
<br/><br/><label>ISBN: </label>0878490426 
<br/><br/><label>Universal Decimal Class. No.: </label>622.23