Martin, John H.  1893- <br/><br/>
Principles of field crop production 
[by] John H. Martin [and] Warren H. Leonard. 
 - New York,  Macmillan Co.,  1949. 
 - ix, 1176 p.  illus., maps.  22 cm. 
<br/><br/>"References" at end of each chapter. 
<br/><br/><label>LCCN: </label>agr49000449  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Field crops--United States.
<br/><br/><label>LC Class. No.: </label>SB187.U6  / M3