Origin of petroglyph
"petroglyph." YourDictionary, n.d. Web. 26 February 2019. <https://www.yourdictionary.com/petroglyph>.
petroglyph. (n.d.). Retrieved February 26th, 2019, from https://www.yourdictionary.com/petroglyph
McKee Springs, Dinosaur National Monument, Colorado
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