TY  - BOOK
AU  - Ruthenberg, Hans
TI  - Farming systems in the tropics
SN  - 0198594828
U1  - 630.913RUT 21
PY  - 1980///
CY  - Oxford 
PB  - Clarendon press
KW  - Farming systems
KW  - Agriculture
N1  - includes index and bibliographical references
ER  -