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roger a kirkby
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Crop Improvement in Eastern and Southern Africa: Research Objectives and On-Farm Testing
Roger A. Kirkby · International Development Research Centre
122 sayfa · 1984
Research / Congresses / Food crops / Agriculture / On-farm
Atlas of common bean (Phaseolus vulgaris L.) production in Africa
Roger A. Kirkby, David J. Allen · International Center for Tropical Agriculture
133 sayfa · 1998
Common bean / Maps