Norma 5071. Escofinas /  
IRAM 
 - 1a. ed. 
 - Buenos Aires :  IRAM,  1956 
 - 12 p. :    fig. ; tab. ;    22 cm 
<br/><br/><label>LC Class. No.: </label> / I 58 
<br/><br/><label>Universal Decimal Class. No.: </label>621.918