TY  - GEN
AU  - Evenson, R. E. 
AU  - Gollin, D. 
TI  - Crop variety improvement and its effect on productivity: the impact of international agricultural research
SN  - 0851995497
U1  - 631.52 
PY  - 2003///
CY  - UK
PB  - CABI Publishing
KW  - Cultivation and harvesting
KW  - Agriculture
KW  - Specific techniques, apparatus, equipment, materials
ER  -