Norma 5276. Material escolar :   plano Packard /  
IRAM 
 - 1a. ed. 
 - Buenos Aires :  IRAM,  1967 
 - 6 p. :    fig. ;    30 cm 
<br/><br/><label>LC Class. No.: </label> / I 58 
<br/><br/><label>Universal Decimal Class. No.: </label>371.6(084.