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    Start Over You searched for: Publication Year 1988 Remove constraint Publication Year: 1988 Subject Term extension systems Remove constraint Subject Term: extension systems Subject Term sustainability Remove constraint Subject Term: sustainability

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    31. The role of farmer testing groups in research and extension: some experiences in Botswana

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    32. U.S. versus Third World research and extension institutions: their effect on farming systems methodology

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    33. U.S. versus Third World research and extension institutions: their effect on farming systems methodology

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    34. the role of farmer testing groups in research and extension: some experiences in Botswana

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