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Steps back in time
被引：0
作者：
Reebs, S
机构：
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D O I：
暂无
中图分类号：
X176 [生物多样性保护];
学科分类号：
090705 ;
摘要：
The finding that some human footprints have been discovered embedded in an ancient layer of volcanic ash near Puebla, Mexico, has stirred the continuing debate about how and when people first arrived in the Americas.
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页码：11 / 11
页数：1
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