Lancaster F. Wilfrid. <br/><br/>
Information retrival systems  Characterstics testing and evaluation 
by F. Wilford Lancaster 
 - New-York  John Wiley and sons Inc.  1968 
 - xiv, 222p. 
 - Information science series .
<br/><br/><label>ISBN: </label>471512400 
<br/><br/><label>LCCN: </label>68-31645 
<br/><br/><label>Dewey Class. No.: </label>029.7  / N684