Technical plan for the development of the telephone services in Colombia 1962 -1970 

 - London  s.n.  s.f. 
 -  tbls.,diagrs.,maps  36 cm. 
<br/><br/>V.1 parte 1 -4 V.2 parte 5 -6 V.3 parte 7 -21 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecomunicaciones<br/>Telefonía<br/>Planes de desarrollo