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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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