Ruthenberg, Hans
Farming systems in the tropics - 2 - Oxford, Clarendon Press 1976 - 366
Farming systems- Tropics/ Agriculture/ Cultivation systems/ Fallow system/ Ley systems/ Perenmial crops/
631.0913 RUT
100
Farming systems in the tropics - 2 - Oxford, Clarendon Press 1976 - 366
Farming systems- Tropics/ Agriculture/ Cultivation systems/ Fallow system/ Ley systems/ Perenmial crops/
631.0913 RUT
100