000 00292nam a2200121Ia 4500
008 160710s1931 xx 000 0 und d
082 _a621.384 DUN
100 _aDUNCAN,RUDOLPH L.
245 _aFOUNDATIONS OF RADIO
260 _bJOHN WILEY & SONS INC
_c1931
300 _a246
942 _2ddc
_cB
999 _c6643
_d6643