Assessing and attributing the benefits from varietal improvement research in Brazil 
Philip G. Pardey... [et al.] 
 - Washington  IFES  2004 
 - 90 p.  30 cm 
 - Research report / IFPRI  136 .
 - Research report / IFPRI .
<br/><br/><label>ISBN: </label>0896291391 
<br/><br/><label>Subjects--Index Terms: </label>Brasil Situacion economica Investigacion Agricultura