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@TheWealthMiner @DanielEarle3 https://t.co/cZzS7JqLsJ It's definitely mentioned in this USGS report, although I'm not entirely sure it's the original source.
@TheWealthMiner @DanielEarle3 https://t.co/cZzS7JqLsJ It's definitely mentioned in this USGS report, although I'm not entirely sure it's the original source.