Willman, H. B.  1901- <br/><br/>
Feldspar in Illinois sands, a study of resources, 
by H. B. Willman. Printed by authority of the state of Illinois. 
 - Urbana, Illinois,  1942. 
 - 87 p.  illus. 
<br/><br/> At head of title: State of Illinois, Dwight H. Green, Governor. Dept. of Registration and Education, Frank G. Thompson, Director. Division of the State Geological Survey, M. M. Leighton, Chief, Urbana. 
<br/><br/><label>LCCN: </label>gs 42000234  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Feldspar.<br/>Sand.
<br/><br/><label>LC Class. No.: </label>TN948.F3  / W5