Learning the radiotelegraph code /  

 - 9. 
 - 48p. : ill. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Radio broadcasting.<br/>Radio frequency allocation.<br/>Radio equipment.<br/>Telecommunication codes.
<br/><br/><label>Dewey Class. No.: </label>621.3842  / L438