Information systems  Unit 1 serial files 

 - London  Open University  1988 
 - 36p.  27cm 
<br/><br/><label>ISBN: </label>0335143350 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data files and databases
<br/><br/><label>Dewey Class. No.: </label>005.74  / OPE