TY  - BOOK
TI  - The agricultural systems of the world; an evolutionary approach
T2  - Cambridge Geographical Studies, 5
U1  - 63.001.3(100)  L4 
PY  - 1974///
CY  - London
PB  - Cambridge University
KW  - Grigg, D.B.
KW  - Agriculture-evolution,Agriculture-classification
ER  -