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1. Dryland crop production systems in semi-arid Botswana : their limitations and potential for improvement / by David Gibbon.

by Gibbon, David P | Internation30148al Workshop on Farming Systems Research (1974 : Hyderabad, I Internation30148al Workshop on Farming Systems Research (1974 : Hyderabad, I Internation30148al Workshop on Farming Systems Research (1974 : Hyderabad, I.

Material type: book Book; Format: print ; Literary form: Not fiction Publisher: Norwich, England : Overseas Development Group, University of East Anglia, [197-]Availability: No items available

2. Crops of the drier regions of the tropics / David Gibbon, Adam Pain.

by Gibbon, David P | Pain, Adam.

Material type: book Book; Format: print ; Literary form: Not fiction Publisher: London ; New York : London ; New York : Longman, 1985Availability: No items available