The fertilization of potatoes in Peru :  I :  a summary and interpretation of data from field experiments completed from 1959 through 1964 in the Sierra 

 - Lima :  North Carolina university-Mission to Peru,  1966 
 - 62: :  graph., tab., append. 
<br/><br/>bibliogr. p. 62, . h. t 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture<br/>Recherche scientifique<br/>Sol<br/>Climat<br/>Engrais<br/>Pomme de terre<br/>Siècle 20<br/>1959-1964
<br/><br/><label>Subjects--Index Terms: </label>Pérou