000 00267nam a2200109Ia 4500
008 231109s9999 xx 000 0 und d
020 _a78816300
090 _aQA76.76.O63 S53754 1990
100 0 _aHERBERT SCHIDT
245 0 0 _aTEACH YOURSELF DOS
260 _bMCGRAW HILL
999 _c12238
_d12238