TY  - BOOK
AU  - D B GRIGG
TI  - THE AGRICULTURAL SYSTEMS OF THE WORLD AN EVOLUTIONARY APPROACH
U1  - GN630G877A 
PY  - 1974///
CY  - LONDON
PB  - CAMBRIDGE AT THE UNIVERSITY PRESS
KW  - THE AGRICULTURAL SYSTEMS OF THE WORLD AN EVOLUTIONARY APPROACH
ER  -