TY  - BOOK
AU  - Grigg, D.B.
TI  - The agricultural systems of the world : An evolutionary approach
SN  - 0 521 09843 2
U1  - 630.91 G 87 T 
PY  - 1978///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Agriculture
KW  - Systems of the World
ER  -