"Houghton, Bennard" <br/><br/>
On-line information retrieval systems 

 - London  Clive Bingley  1977 
 - 159p. 
<br/><br/><label>ISBN: </label>208016600 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information retrieval
<br/><br/><label>Dewey Class. No.: </label>025.524 Hou