000 00329nam a2200121Ia 4500
008 220201s1993 xx 000 0 eng d
041 _aENG
100 _aRAGHUWANSHI, B S
245 0 _aINTRODUCTION TO DIGITAL & DATA COMMUNICATION
260 _aLONDON
_bTHAMES AND HUDSON PUBLISHING COMPANY
_c1993
300 _a435
942 _2ddc
999 _c59727
_d59727