000 00231nam a22000977a 4500
082 _a621.384 REF'E
245 _aREFERENCE DATA FOR RADIO ENGINERS
260 _aNEWYORK
_bTELEPHONE & TELEGRAPH
_c1961
300 _a1121P
942 _cBK
999 _c569087
_d569087