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Hundreds of obsidian artifacts have revealed where the Aztecs acquired the volcanic glass they used for tools ... on a broad scale dates to the Archaic period, which was from 6000 to 2000 BC ...
Hundreds of obsidian artifacts have revealed where the Aztecs acquired the volcanic glass they used for tools ... and the use of obsidian on a broad scale dates to the Archaic period, which was from ...
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