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Seeing Colour: Succeed with the Spectroscope
https://gemologyonline.com/Forum/phpBB2/viewtopic.php?f=4&t=25677
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Author:  Barbra Voltaire, FGG [ Wed May 06, 2020 9:17 pm ]
Post subject:  Seeing Colour: Succeed with the Spectroscope

From AGTA Tucson:

Speakers: Charles Bexfield, FGA, DGA, EG

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