Cost analysis of model mines for strip mining of coal in the U S 

 - Washington  Govt Printer USA          1972 
 - 116p.  cm. 
 - US, National Technical Information Service .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal  Industry
<br/><br/><label>Dewey Class. No.: </label>X9(F551):26.73.N7, L2/GD