000 00315nam a2200121Ia 4500
008 220201s1993 xx 000 0 eng d
082 _a5.74
_bReference OB
100 _aReference obbins (J) .
245 0 _aMastering DOS 6 special ed .
260 _bBPB Publications
_aNew Delhi
_c1993
300 _a999
942 _2ddc
999 _c7415
_d7415