Ce livre relate l'expédition menée par Ernest Saint Charles Cosson, Henri Duveyrier, et Jules René Bourguignat dans le Sahara, où ils ont rencontré et étudié les touâregs du Nord. Il offre une vue unique sur la culture et la vie quotidienne de ces nomades, ainsi que sur les défis et les aventures liés à l'expédition elle-même.

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