Extraterrestrial Markers Found at Clovis Sites Across North America Alfred P West,Richard B Firestone,James P Kennett,Luann Beckermag(2007)引用 25|浏览2暂无评分关键词boundary layer,human behavior,environmental change,younger dryasAI 理解论文溯源树样例生成溯源树,研究论文发展脉络Chat Paper正在生成论文摘要