Telephone engineer and management. 

 - Chicago :  Telephone engineer publishing Corp,  1974. 
 - v. :  ilus ;  28 cm. 
<br/><br/>V.78 No.9. V.78 No.11. V.78 No.18. V.78 No.19. V.78 No.20. V.78 No.21. V.78 No.23. V.78 No.24.