Ray   ,K.  P. <br/><br/>
Statistical techniques  in commerce and economics. 
by    K. P  Roy. 
 - 5th rev. ed.   
 - Calcutta.  Progressive  Publishers.  1974 
 - xv,377p.;    24cm. 
<br/><br/><label>Dewey Class. No.: </label>330.0182  / RAY