000 003030000a22001330004500
245 _aElements of radio
100 _aHellman, C.I.
250 _a3d ed.
260 _aNew Delhi
_bAfflicated East West Press
_c1964
300 _a354 p., ill.
080 _a621.396
_bH4
041 _aEN
942 _cBK
999 _c52768
_d52768