Leonard, Warren H Martin, John H Stamp, David L <br/><br/>
Principles for field crop production 

 - 3rd. ed. 
 - New York  Macmillan publishing co. inc.  1976 
 - xi,1118p.; 22cm. 
<br/><br/><label>ISBN: </label>23767200 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crops<br/>Crops