Martín, John Holmes. <br/><br/>
Principles of field crop production 

 - New York :  MacMillan,  1949 
 - 1176 p.  : ilus 
<br/><br/><label>LCCN: </label>31326 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultura--E.U.A.<br/>Cultivos.
<br/><br/><label>Dewey Class. No.: </label>633  / M37