R.S.Mehla, J.K.Verma, R.K.Gupta and P.R.Hobbs <br/><br/>
Stagnation in the Productivity of Wheat in the Indo-Gangetic Plains 

 - Rice-Wheat 
 - New Delhi  IARI 
<br/><br/><br/>ENGLISH 
<br/><br/><label>Dewey Class. No.: </label>633.18  / MEH