ACOS-4/AVP DD/DS user's guide :DFC26E-5 

 - 2nd ed. 
 -  Tokyo:NEC  1987 
 - 150 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data dictionary/Directory system(DD/DS): ACOS operating sys
<br/><br/><label>Dewey Class. No.: </label>519.68/12  / NS