TY  - BOOK
AU  - Hans Ruthenberg
TI  - Farming systems in the tropics. Ed 3
SN  - 0-19-85948-X
U1  - 630.913 
PY  - 1980///
CY  - Oxford
PB  - Clarendon Press
N1  - Hans Ruthenberg: Farming systems in the tropics. Ed 3.  (3rd Edition)  Oxford.  Clarendon Press, 1980. 0-19-85948-X--(630.913RUT)
ER  -