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![](./images/clear.gif) 1.- Age constraints on alleged "footprints" preserved in the Xalnene Tuff near Puebla, Mexico
Geological Society of America (GSA); Boulder, CO; USA; United States, 2009
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![](./images/clear.gif) 2.- The archaeology, stratigraphy, and geochronology of the Hueyatlaco site, Mexico
Geological Society of America (GSA); Boulder, CO; USA; United States, 2008
Geological Society of America, 2008 annual meeting
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