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Ancient footprints show how early human species lived side by side
Ancient footprints capture coexistence of two kinds of human ancestor
Ancient footprints challenge old timeline of human arrival in America
Ancient Footprints in New Mexico Shift Timeline for Early Human Presence in North America
Ancient Footprints Affirm People Lived in the Americas More Than 20,000 Years Ago
New Evidence That Ancient Footprints Push Back Human Arrival in North America
