Changes

1 byte added , 18:55, September 26, 2018

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→‎External links: HTTP --> HTTPS [#1], replaced: http://www.britannica.com → https://www.britannica.com

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==External links==

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*~~http~~://www.britannica.com/topic/opal

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*https://www.britannica.com/topic/opal

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Opal (view source)