Hunger signs in crops; a symposium, prepared 

 - Washington, D.C. :  American Society of Agronomy,  1949 
 - 390 p.  : ilus 
<br/><br/><label>LCCN: </label>19556 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Plantas--Deficiencias nutritivas.<br/>Plantas--Nutrición.
<br/><br/><label>Dewey Class. No.: </label>581.21  / A54 1949