Knapp, George N. <br/><br/>
The foundry sands of Minnesota, 
by G. N. Knapp. 
 - Minneapolis,  The University of Minnesota,  1923. 
 - vi, 105 p.  illus.  23 cm. 
 - Minnesota. Geological survey. Bulletin  no. 18 .
<br/><br/> At head of title: The University of Minnesota. 
<br/><br/><label>LCCN: </label>gs 23000113  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sand.
<br/><br/><label>LC Class. No.: </label>QE127  / .A22 no. 18