Dialog on disc discovery  users' guide 
Dialog Information Services                                  
 - California  Dialog Information Services  1988 
 - [various pagings.] 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and Astrophysics Thesaurus<br/>CD-ROM<br/>Dialog OnDisc
<br/><br/><label>Universal Decimal Class. No.: </label>025.5  / DIA