{"id":"000079964","type":"book","title":"Raw materials in the middle Pleistocene sites of Atapuerca (Burgos, Spain)","publisher-place":"Madrid","pages":"239-242","container-title":"VI International Flint Symposium: Abstracts (Madrid, october 1991","author":[{"family":"Martín Nájera","given":"Aurora."}],"issued":{"raw":"1991"}}