000			00360nam a2200133Ia 4500
005			20260413100613.0
008			230516s9999||||xx |||||||||||||| ||und||
100			_aSchilling Donald L& Taup Herbert
245		0	_aPrinciples of communication system
260			_bDelhi Tata mograw hill _c1986
300			_a759
942			_cGB
999			_c2670 _d2670