000 00285cam a2200121 4500
020 _a0273024787 (pbk.)
100 1 _aLANGLEY Graham
245 0 _aTelecommunications primer
250 _a2nd.
260 _aLondon:
_bPitman Publishing,
_c1986
300 _a170p.
945 _i0010490
_rY
_sY
999 _c45813
_d45813