DOUBLE DENSITY. -- DATA BECKER SOFTWARE. 

 - BARCELONA:   MARCOMBO  1992 
 - 61 P.  22 CM. 
<br/><br/> INCLUYE INDICE. 
<br/><br/><label>ISBN: </label>84-267-0882-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>1.DOUBLE DENSITY.
<br/><br/><label>Dewey Class. No.: </label>001.6442 D68