000 00289nam a2200121Ia 4500
100 _aParker, Sybil P
020 _a0-07-045510-4
942 _cBK
245 _aCommunications source book
260 _aMcGraw-HIll book company, New York
_cc1988
082 _a621.38 Par
300 _aviii,359
999 _c29439
_d29439