Designs at three Spanish sites are thought to predate human arrival in Europe by at least 20,000 years. Designs at three Spanish sites are thought to predate humans' arrival in… Click to show full abstract
Designs at three Spanish sites are thought to predate human arrival in Europe by at least 20,000 years. Designs at three Spanish sites are thought to predate humans' arrival in Europe by at least 20,000 years.
               
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