00302nam a2200121Ia 4500008004000000082001800040100002500058245002900083250000500112260003800117300001300155650001200168210210b1965   xxu||||| |||| 00| 0 eng d  a621.3841 HELE  aHELLMAN (Charles I).  aElements of radio. Ed 3.  a  aLondon.bD Van Nostrand Co,c1965  axiii,354  aRadio