000 00329nam a2200133Ia 4500
008 190711s9999 xx 000 0 und d
020 _a027302986X
082 _a621.38195404 P876
100 _aPOULTON,S
245 0 _aPACKET SWITCHING AND X.25 NETWORKS
260 _aLONDON
_bPitman
_c1989
300 _a25X19
942 _cBK
_2DDC
999 _c25304
_d25304