000 00302nam a2200121Ia 4500
008 220201s1995 xx 000 0 eng d
082 _a621.381
_bKES
100 _aKessler, Garg C
245 0 _aISDN concepts faclities and service
260 _aDelhi
_bMcgraw Hill
_c1995
300 _a453
942 _2ddc
999 _c34914
_d34914