TY  - BOOK
AU  - Grigg,David B.
TI  - The agricultural systems of the world: an evolutionary approach 
T2  - Cambridge geographical studies
SN  - 0521098432
AV  - S439 .G788
U1  - 630/.9 
PY  - 1974///
CY  - London, New York
PB  - Cambridge University Press
KW  - Agricultural geography
KW  - Agriculture
KW  - History
N1  - Includes index; Bibliography: p. 308-343
ER  -