Massive ice wall may have blocked passage for first Americans - Livescience.com
- Massive ice wall may have blocked passage for first Americans Livescience.com
- Cosmic Rays and Perturbed Boulders Suggest First People to Reach Americas Came by Coast Gizmodo
- Dating of boulders suggests Ice-Free Corridor from Beringia to Great Plains existed 13,800 years ago Phys.org
- First Americans: no ice-free entry Cosmos
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