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2
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The grazing land ecosystems of the African Sahel / Henry Noël Le Houérou.
- Springer,
- 1989.
- Berlin [etc.] :
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Germination and establishment of Sahelian rangelands species / W.Th. Elberse and H. Breman.
- Springer,
- 1989.
- [S.l.] :