000			00356pam a2200145a 44500
082			_a621.384151 _bB43r
100			_aBennington, T. W.
245	1		_aRADIO WAVES AND THE IONOSPHERE
260			_aLondon _bWireless World, Iliffe _c1950
300			_a81
650			_aRadio, Short Wave
650			_aElectric Waves
964			_gCIRC
997			_a3557 s C
999			_c435901 _d435901