Installation and maintenance of electric supply and communication lines :  safety rules and discussion /  
National Bureau of Standards. 
 - Washington :  U. S. Govt. Print. Off.,  1949. 
 - v, 386 p.  illus., maps.  21 cm. 
 - National Bureau of Standards. Handbook 43 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>INGENIERIA ELECTRICA<br/>LINEAS ELECTRICAS
<br/><br/><label>Universal Decimal Class. No.: </label>621.315