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@LiveScience: 'Clamshells Reveal Secrets of Pre-Columbian Society's Decline' http://t.co/1N2N2Vs91t From #Geology: http://t.co/lLVo4BtyZ9
@LiveScience: 'Clamshells Reveal Secrets of Pre-Columbian Society's Decline' http://t.co/1N2N2Vs91t From #Geology: http://t.co/lLVo4BtyZ9