Maximum crop yields; the challenge 

 - Madison,  1967 
 - 92 p.  : ilus 
 - ASA special publication  ; 9 .
 - ASA special publication  ; 9 .
<br/><br/><label>LCCN: </label>19559 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cultivos--Rendimiento.
<br/><br/><label>Dewey Class. No.: </label>633  / A5