Farming systems in the tropics /
Ruthenberg, Hans.
Farming systems in the tropics / Hans Ruthenberg. - Oxford : Clarendon Press, 1971. - xiv, 313 p. :
2778
Agricultural systems
630.913 / Fa
Farming systems in the tropics / Hans Ruthenberg. - Oxford : Clarendon Press, 1971. - xiv, 313 p. :
2778
Agricultural systems
630.913 / Fa