000 002940000a22001210004500
245 _aTelecommunications and the computer
100 _aMartin, James
260 _aEnglewood Cliffs
_bPrentice Hall
_c1969
300 _a470 p., ill.
080 _a621.39:681.3
_bM3
041 _aEN
942 _cBK
999 _c94829
_d94829