TY  - BOOK
AU  - Grigg, D B
TI  - The Agricultural systems of the world: an evolutionary approach
SN  - 0-521-20269-8
U1  - 338.1 21st
PY  - 1974///
CY  - New York
PB  - Cambridge University Press
KW  - Agricultural systems; Agricultural geography; Agricultural resources
ER  -