000			00331nam a2200121Ia 4500
005			20251007104237.0
008			251006s9999 xx 000 0 und d
100			_abeck,g.e.
245		0	_a.navigation systems,a survey of modern electronic alds. beck,g.e.
260			_a1st.ed | .London Van Nostrand
260			_c1971
942			_cBOK
999			_c3159 _d3159