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| Beauvilain, Alain. The contexts of discovery of Australopithecus bahrelghazali (Abel) and of Sahelanthropus tchadensis (Toumaï): unearthed, embedded in sandstone, or surface collected?. S. Afr. j. sci., June 2008, vol.104, no.5-6, p.165-168. ISSN 0038-2353
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