000 00282nam a2200109Ia 4500
020 _a8185814074
100 _aJohn Ronayne
245 _aIntegrated services digital network:from concept to application
260 _c1993
_bWHEELER PUBLISHING
_aAllahabad
300 _a230
942 _cBK
999 _c20058
_d20058