000 00280 a2200121 4500
001 58748
082 _a537 REN
090 _c36063
_d36063
100 _aReston R N
245 _atelecommunication principles
260 _aLondon
_bSir Issac Pitman & Sons
_c1953
300 _a450 p.
942 _aNUST-CAE
_k537 REN
999 _c293821
_d293821