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Duncan, Alan J. ,  Gerard, Bruno G. ,  Valbuena, Diego ,  Blümmel, Michael ,  Tarawali, Shirley A. ,  [Crop residues in smallholder systems: Pressures and trade-offs] ,  Crop residues in smallholder systems: Pressures and trade-offs

Ayantunde, Augustine A. ,  Tarawali, Shirley A. ,  Wright, Iain A. ,  [Rangeland-based livestock production systems in the arid and semi-arid tropics: Challenges and opportunities] ,  Rangeland-based livestock production systems in the arid and semi-arid tropics: Challenges and opportunities