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OF-03-10 Evaluation of Mineral and Mineral Fuel Potential of Douglas and Elbert Counties State Mineral Lands Administered by the Colorado State Land Board - Colorado Geological Survey
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No. 36156: Opal (Common) from Douglas County, Washington in Online Mineral Museum | Rocks and minerals, Rock minerals, Minerals
![Coast Douglas fir (Pseudotsuga menziesii var. menziesii) - Mineral tree in 1929 or 1930, shortly before it fell in a wi… | Ancient tree, Tree forest, Ancient forest Coast Douglas fir (Pseudotsuga menziesii var. menziesii) - Mineral tree in 1929 or 1930, shortly before it fell in a wi… | Ancient tree, Tree forest, Ancient forest](https://i.pinimg.com/564x/8d/48/12/8d481254d0a86e0c612ad23d651c8cf5.jpg)