00250nam a2200109 a 450000500170000008200170001710000250003424500240005925000120008326000210009530000240011620251203090452.0  a005.434bkin  aKing, Richard, Allen  aIBM PC-DOS handbook  a2nd ed.  aDelhi: BPBc1987  axxiv, 340p.c23 cm.