Roepke, Wallace W. <br/><br/>
Bureau of mines coal cutting technology facilities at the twin cities research center 
Roepke, Wallace W. 
 - Washington  Bureau of mines  1983 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>TECNOLOGIA MINERA
<br/><br/><label>Universal Decimal Class. No.: </label>622.06