TY  - BOOK
AU  - GRIGG, D. B.
TI  - The Agricultural System of the World: An Environmental Approach
SN  - 9780521098434
U1  - 630 GRI. 
PY  - 1974///
CY  - New York
PB  - Cambridge University Press
N1  - Includes Appendix, Bibliography and Index
ER  -