Variability in Grain yields   Implications for Agricultural Research and Policy in developing Countries . 

 - London   The John Hopkins University press  1984 
<br/><br/><label>ISBN: </label>0801837936 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Wheat Trade -Developing Countries -Seasonal Variations .
<br/><br/><label>LC Class. No.: </label>FASS HD 9049 .W5V37