000 00309nam a2200145Ia 4500
008 220421s9999||||xx |||||||||||||| ||und||
020 _c225
040 _aET
100 _aM. JAIN
245 0 _aDATA COMMUNICATIONAND NETWORK
260 _bBPB PUB.
_aDELHI
300 _a73
500 _a18960
942 _cBK
999 _c25185
_d25185