Testing the Colour of Gemstones - A Collection of Historical Articles on the Dichroscope, Filters, Lenses and Other Aspects of Gem Testing
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Malinowski PressISBN 9781473390577
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Testing the Colour of Gemstones - A Collection of Historical Articles on the Dichroscope, Filters, Lenses and Other Aspects of Gem Testing
Various
41,220
Words
50m
Time
318
WPM
+34%
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