Telephone engineer and management. 

 - Chicago :  Telephone engineer publishing Corp,  1976. 
 - v. :  ilus ;  28 cm. 
<br/><br/>V.80 No.1. V.80 No.2. V.80 No.3. V.80 No.4. V.80 No.5. V.80 No.6. V.80 No.7. V.80 No.8. V.80 No.9. V.80 No.10. V.80 No.11. V.80 No.13. V.80 No.21. V.80 No.22. V.80 No.23. V.80 No.24.