000			00373nam a2200181Ia 4500
008			240220s9999 xx 000 0 und d
041			_aENG
082			_a16404
100			_aStevens A. L.
245		0	_aTeach yourself dos.
260			_aNULL
260			_bMiss Press.
260			_c1989
300			_a267p.
365			_b235
650			_aCOMPUTER
942			_cDBK
999			_c25075 _d25075