Spencer, Frank Darwyn,  1904- <br/><br/>
Coal resources of Indiana. 

 - Washington,  1953. 
 - iv, 42 p. :  maps, diagrs., tables ;  27 cm. 
 - Geological Survey circular 266 .
 - Geological Survey (U.S.).  Circular ;  no. 266. .
<br/><br/>Bibliography: p. 41-42. 
<br/><br/><label>LCCN: </label>gs 54000220  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal--Indiana.
<br/><br/><label>LC Class. No.: </label>QE75  / .C5 no. 266