Uses of isotopes in agricultural studies. 

 - Washington :  U.S. Goverment Printing Office,  1960. 
 - 44 p. :  : ilus. 
<br/><br/><label>LCCN: </label>39554 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Energía atómica en agricultura.