Voskuil, Walter H.  1892- <br/><br/>
A geography of minerals / 
Walter H. Voskuil. 
 - Dubuque :  W. C. Brown Co.,  1969. 
 - ix, 117 p. :  maps. ;  23 cm. 
 - The Brown foundations of geography series .
<br/><br/>Bibliography: p. 112-114. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mines and mineral resources.
<br/><br/><label>Dewey Class. No.: </label>553  / VOG 1969