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DanBC
on March 21, 2020
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Rai Stones
I find these stones fascinating. You might be interested in this NPR article:
https://www.npr.org/sections/money/2011/02/15/131934618/the-...
DoreenMichele
on March 21, 2020
[–]
It's a good read with a little more color than the Wikipedia piece.
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