Chekan, Gregory J. <br/><br/>
Design of bulkheads for controlling water in underground mines 
Chekan, Gregory J. 
 - Washington  Bureau of mines  1985 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>AGUA SUBTERRANEA
<br/><br/><label>Universal Decimal Class. No.: </label>622.51