TY  - BOOK
AU  - Grigg,D.B.
TI  - The agricultural systems of the world: an evolutionary approach 
SN  - 0521202698
PY  - 1974///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Agricultural geography
KW  - Agriculture
KW  - History
N1  - Includes bibliographies and indexes
ER  -