Petrified Wood from Washington, USA
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| T Douglas Schonewald Collection |
| www.mineralcouncil.org (n.d.) http://www.mineralcouncil.org/ Paul De Bondt collection |
Thomas A. Dillhoff , Miocene Woods of Eastern Washington, Evolving Earth Foundation | |
| Dake, H. C. (1956) Northwest Gem Trails - A Field Guide for the Gem Hunter, Mineral Collector and Tourist (2nd ed.) Gembooks. |
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| Gorden De'Young collection |
Grant County, Washington, USA