Barnes Ralph M. <br/><br/>
Motion an time study 

 - 4th 
 - New York  John Wiley & Sons USA    1958 
 - 664p.  cm. 
<br/><br/><label>Standard No.: </label>246,795 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>X:891, K2