000 00267pam a2200121a 44500
010 _a64066082
082 _a530.15
_bSA57P
100 _aSanford, Richard S.
245 1 _aPHYSICAL NETWORKS
260 _a
_bPrentice-Hall
_c1965
964 _gCIRC
997 _a58516 C
999 _c411058
_d411058