The Spectroscope and Gemmology
The Spectroscope and Gemmology
Mitchell, R. Keith: -
R. Keith Mitchell, FGA, Tully Medallist and a vice-president of the Gemmological Association, was instructor to the G.A. courses for more than twenty years, and the author of many papers on gemmology.
309.94Lei
309.94Lei
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Mitchell, R. Keith: -
R. Keith Mitchell, FGA, Tully Medallist and a vice-president of the Gemmological Association, was instructor to the G.A. courses for more than twenty years, and the author of many papers on gemmology.
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