000 00293nam a2200109Ia 4500
008 140917b1984 xxu||||| |||| 00| 0 eng d
082 _a621.382, LAN
100 _aGraham Langley
245 _aTelecommunications primer
260 _aNew Delhi :
_bGalgotia,
_c1984
700 _aLangley, Graham
999 _c214674
_d214674