Stone, Ralph W.  1876-1964. <br/><br/>
Coal near the Black hills, Wyoming--South Dakota. 

 -  Govt. Print. Off.,  1912. 
 - 66 p. 
<br/><br/><label>LCCN: </label>gs 12000257  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal mines and mining--Wyoming.<br/>Coal mines and mining--South Dakota.
<br/><br/><label>LC Class. No.: </label>QE75  / .B9 no. 499