00206nam a22000857a 4500082001800000100001700018245004800035260002800083300000900111  a621.782 REN'T  aRENTON, R. M  aTELECOMMUNICATION PRINCIPLES (IN MKS UNITS)  aLONDONbSIR ISAACc1964  a448P