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Obsidian flow at Glass Mountain, Siskiyou County, CA   (view details)   

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Using this photo   Permission is granted to use the enlargement for personal, academic, or non-profit purposes as long as the user fills out the following form: https://forms.gle/R2ZUig8o8iYj4TrW9 and the image is clearly credited with Dr. G Dallas and Margaret Hanna © California Academy of Sciences. For higher resolution images or commercial use please fill out this form: https://forms.gle/QKoVskQBcnYZPbrD6. Please make sure to include the 16 digit ID number for the image.

Obsidian flow at Glass Mountain, Siskiyou County, CA
©2008 California Academy of Sciences

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