Larsen, Gwyne <br/><br/>First look at... DOS  -- New York:  Mitchell McGraw Hill,  1992. <br/>viii, 136 p.  23 cm. <br/><br/> Includes index. <br/><br/><label>ISBN: </label>0070365857 <br/><br/><label>Dewey Class. No.: </label>GS Cir 004 L32 1992