Douglas W J <br/><br/>
Production systems analysis    In underground coal mines 

 - N York   McgHills        1980 
 - xii, 369p.  cm. 
<br/><br/><label>Standard No.: </label>134,545 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ECONOMICS
<br/><br/><label>Dewey Class. No.: </label>X8(F551):89P, M0