000 00327nam a2200121 4500
008 160616s 000 0
245 _aRadio ray propagation in the ionosphere
100 _aKelso, John M
440 _aMcGraw-Hill electronic sciences series
500 _aB9:6358 K4
942 _cBK
_2BK10111
080 _a523.01 KEL
999 _c10111
_d10111