Humans & society: Earliest known stone tools unearthed: At 3.3 million years old, flakes, cores predate origin of Homo
Publisher： John Wiley & Sons Inc
E-ISSN： 1943-0930|187|12|6-6
ISSN： 0036-8423
Source： SCIENCE NEWS, Vol.187, Iss.12, 2015-06, pp. : 6-6
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