NATIONAL Symposium on "approach to higher productivity of crops " (Calcutta: 1978) Gupta, D.K.Das <br/><br/>
Higher productivity in agriculture / 
19-20- May 1978: Calcutta, edited by D.K.Das Gupta, N.C.Chattopadhyay 
 - New Delhi  Oxford & IBH publishing Co.  1980 
 - 178 p. 
<br/><br/><label>ISBN: </label>68584 
<br/><br/><label>Dewey Class. No.: </label>631.5  / NAT