00310nam a2200109Ia 4500008004100000041000800041082002000049100001900069245006800088260003600156300000800192211209s1987 xx 000 0 und d aeng a621.382 N87 TOW aTOWNSEND, CARL aPRACTICAL DIGITAL AND DATA COMMUNICATION WITH LSI APPLICATIONS  aNEW JERSEYbPRENTICE HALLc1987 a246