Hans Ruthenberg
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Farming Systems in the Tropics
Ruthenberg, Hans
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Farming systems in the tropics
Ruthenberg, Hans
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Innovation Policy for Small Farmers in the Tropics: The Economics of Technical Innovations for Agricultural Development
Ruthenberg, Hans; Jahnke, Hans E. [Editor]
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African Agricultural Production Development Policy in Kenya 1952–1965 (Afrika-Studien, 10)
Ruthenberg, H.
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