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| Firstname: | W. T. |
| Surname: | Federer |
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| Importance and sustainability of root crops-based systems in sub-Saharan Africa, Ezumah, H. C., Lawson, T. L., Federer, W. T. and Awa, N. E., in: Journal of the West African Farming Systems Research Network, volume 2, number 1, pages 15-30, 1992. |
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