TY  - GEN
AU  - Grigg, D B
TI  - Agricultural systems of the world : An evolutionary approach
T2  - Cambridge geographical studies
SN  - 0 521 20269 8
U1  - 630 GRI 
CY  - Cambridge, Cambridge University Press
KW  - Agricultural systems- World/ Wet-rice cultivation- Asia/ Technical economic changes agriculture
ER  -