| http://www.w3.org/ns/prov#value | - As more work is done and techniques for dating advance, it is likely that this four-period dating scheme will be modified in particular regions and that more will be learned about the origins and demise of Saharan rock art.Department of Arts of Africa, Oceania, and the Americas, The Metropolitan Museum of ArtDepartment of Arts of Africa, Oceania, and the Ame
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