Schmitz, Ruth <br/><br/>
Practical dos! ms/pc-dos / 
Ruth Schmitz 
 - California   Mitchell Publishing Inc  1989 
 - xvii.; 281 p.; ill.; 23cm  23cm 
<br/><br/><label>ISBN: </label>39439485  39439485 
<br/><br/><label>ISSN: </label>39439485