TY  - BOOK
AU  - Grigg,David B.
TI  - The agricultural systems of the world: an evolutionary approach 
SN  - 0521202698 
AV  - S 439 .G75 1974
U1  - 630/.9 
PY  - 1974///
CY  - London
PB  - Cambridge University Press
KW  - Agricultural geography
KW  - Agriculture
KW  - History
N1  - Includes index; Bibliography: p. 308-343
UR  - http://www.loc.gov/catdir/description/cam032/73082451.html
UR  - http://www.loc.gov/catdir/toc/cam031/73082451.html
ER  -