Johnson Leonard G <br/><br/>
Theory and technique of variation research 
Johnson Leonard G 
 -  1964 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>46904 
<br/><br/><label>Source: </label> Annuals, Advances 
<br/><br/><label>Dewey Class. No.: </label>B285, K4