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- [3] THE ORIGINS OF FOOD-PRODUCTION IN NORTHEAST AFRICA PALAEOECOLOGY OF AFRICA - DELTA, 1984, 16 : 317 - 324
- [4] WEEDS AS A CONSTRAINT TO FOOD-PRODUCTION IN AFRICA PEST MANAGEMENT AND THE AFRICAN FARMER, 1989, : 83 - 99
- [7] THE SPREAD OF FOOD-PRODUCTION IN SUB-SAHARAN AFRICA JOURNAL OF AFRICAN HISTORY, 1962, 3 (02): : 211 - 228