000			00560pam a2200181a 44500
082			_a538.761 _bIn8u
100			_aPiggott, W. R.
245	1		_aURSI HANDBOOK OF IONOGRAM INTERPRETATION AD REDUCTION
260			_aAmsterdam _bElsevier Pub. Co. _c1961
300			_a192
440			_aInternational Scientific Radio Union. Ursi Monographs _v
500			_aReference Materials And Facilities
650			_aIonospheric Radio Wave Propagation -- Observations
650			_aIonospheric Research
700			_aRawer, K.
964			_gCIRC
997			_aK9498 C
999			_c386015 _d386015