Mitchell, David Ray,  1898- <br/><br/>
Washability characteristics of Illinois coal screenings, 
by D. R. Mitchell and L. C. McCabe. 
 - Urbana, Illinois,  1937. 
 - 84 p.  illus. 
<br/><br/> At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey.  In cooperation with the Engineering Experiment Station, University of Illinois. 
<br/><br/><label>LCCN: </label>gs 38000135  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal--Testing.<br/>Coal--Illinois.
<br/><br/><label>LC Class. No.: </label>TN816  / .M55