Doane, F. B.  <br/><br/>
Magnaflux Aircraft Inspection Manual 

 - 2a ed, 4ta impr 
 - Chicago :   Photopress,   1943. 
 - p. 193 
<br/><br/><label>Subjects--Topical Terms: </label><br/>INSPECCION DE AERONAVES<br/>ENSAYOS NO DESTRUCTIVOS<br/>MAGNAFLUX
<br/><br/><label>Universal Decimal Class. No.: </label>620.179.14