Chapman, Stephen R. <br/><br/>
Crop production :  principles and practices / 
Stephen R. Chapman and Lark P. Carter. 
 - San Francisco :  W. H. Freeman,  c1976. 
 - 566 p. :  ill. 
<br/><br/><label>ISBN: </label>0716705818 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Field crops--North America.<br/>Field crops.