Metcalfe, Darrel S. <br/><br/>
Crop production :  principles and practices / 
Darrel S. Metcalfe, Donald M. Elkins. 
 - 4th edition. 
 - New York :  Macmillan,  c1980. 
 - ix, 774 pages :  Illustrations ;  25 cm. 
<br/><br/> First-2d ed. by H. D. Hughes and E. R. Henson; 3d ed. by H. D. Hughes and D. S. Metcalfe. 
<br/><br/>Includes bibliographies and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Field crops.
<br/><br/><label>LC Class. No.: </label>SB185  / .H75 1980 
<br/><br/><label>Dewey Class. No.: </label>633