Levens A S <br/><br/>
Graphical methods in research 

 -  1965 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>41808 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Graphical methods<br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B33:6, K5