Martin, John H.  <br/><br/>
Principles of field crop production /  John H. Martin and Warren H. Leonard. 

 - New York :  Macmillan company,  c 1951. 
 - ix, 1176 p. :  ill. ;  20 cm. 
<br/><br/> Includes index. 
<br/><br/>330  330 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Crop production.
<br/><br/><label>Dewey Class. No.: </label>633 / M364p