P.L.S <br/><br/>
WPL Searching 
User Manual 
 - Rockville  PLS  1992 
 - viii,143p  pbk 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computers:--Manual  
<br/><br/><label>LC Class. No.: </label>QA75. 1992