"...places that were used for thousands of years to create these tools."
"...places that were used for thousands of years to create these tools."
http://www.sierranevadageotourism.org/content/obsidian-mines/sieFAEB194D18124A5AF
http://www.sierranevadageotourism.org/content/obsidian-mines/sieFAEB194D18124A5AF
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