Kohnke, Helmut. <br/><br/>
Soil science simplified /  
Helmut Kohnke. 
 - West Lafayette, Indiana :    Balt Publishers,    1962, 1966. 
 - 78 p. :    ill. ;    21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Soil science.
<br/><br/><label>Dewey Class. No.: </label>631.4