UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF MINES <br/><br/>
MINE HOIST ELECTRICAL SYSTEMS STUDY 

 - SPRINGFIELD  N.T.I.S 
 - 29X23 
 - REPORT NO.83-86 PB 86-235132 .
<br/><br/><label>Dewey Class. No.: </label>622.6 U58