Tʻongsin kisul ŭi kichʻo / 
Choguk Powi Huwŏnhoe Chungang Wiwŏnhoe chŏ. 
 - Che 4-pʻan. 
 - Pʻyŏngyang :  Kungnip Kongŏp Kisul Sŏjŏk Chʻulpʻansa,  1959. 
 - 320 p. :  ill. ;  19 cm. 
<br/><br/><label>LCCN: </label>k  67000929  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telegraph, Wireless.<br/>Radio operators--Korea (North)
<br/><br/><label>LC Class. No.: </label>TK5724.K6  / C47