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040			_aMAIN
041			_aEnglish
082			_a621.382 _bHAR
100			_aHarbottle, H. R. and Hanman, B. L. G.
245		4	_aThe principles of telecommunications engineering
260			_aLondon _bThe English University _c1965
300			_axii,373p.
650			_aCommunication engineering
650			_aEngineering
942			_cBK
999			_c41356 _d41356