TY  - BOOK
AU  - Hans Ruthenberg
TI  - Farming systems in the tropics
U1  - 630.913 
PY  - 1971///
CY  - London
PB  - Oxford University Press
N1  - Hans Ruthenberg: Farming systems in the tropics.  London.  Oxford University Press, 1971.--(630.913RUT)
ER  -