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How the Sasquatch people were exterminated on the continents is described in
"The Sasquatch Message to Humanity" - Book 1, which can be read online here (but the PDF viewer on that page is not very...

The Seraphine Long story with some photos:
https://scenicsasquatch.com/2018/10/01/the-story-of-seraphine-long-the-woman-who-gave-birth-to-sasquatch/

Another article by Sasquatch contactee SunBôw...