Chalekode, P. K. <br/><br/>
Source assessment coal refuse piles abandoned mines  and outcrops  state of the art / 
P. K. Chalekode  and T. R. Blackwood 
 - Washington :  U.S. G.P.O.,  1978 
 - xii, 39 p. ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal Mining--United States
<br/><br/><label>Dewey Class. No.: </label>343.07752