000 002810000a22001090004500
245 _aTelecommunication principles for final certificate vol.2 principles C
100 _aKnight, S.A.
260 _aLondon
_bButterworths
_c1971
080 _a621.39
_bK6
041 _aEN
942 _cBK
999 _c92761
_d92761