A guide to selected computer-based information services / 
compiled by Ruth Finer 
 - London :  Bowker-Saur,  1972 
 - 4, 113 p. ;  21 cm. 
<br/><br/><label>ISBN: </label>0851420451 
<br/><br/><label>LCCN: </label>73-156209 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Information services--Directories<br/>Technology--Information services--Directories