000 00303nam a22001097a 4500
082 _a621.3192 HAR'T
100 _aRALPH, F,MORNET, P,HARTLLEY, G. C
_980497
245 _aTECHNIQUES OF PULSE CODE MODULATION IN COMMNICATIONS NETWORKS
260 _aLONDON
_bCAMBRIDGE
_c1967
300 _a110P
942 _cBK
999 _c585421
_d585421