Shergill, H.S. <br/><br/>
Sustainability of wheat-rice production in Punjab: a re-examination 

 -  2007 
 - p.81-85. 
 - 29 Dec 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rice - India - Punjab<br/>Wheat - India - Punjab<br/>Agricultural production - India - Punjab<br/>Agricultural production