5325166
9780943763521
R. Keith Mitchell, FGA, Tully Medalist and 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 gemology.Mitchell, R. Keith is the author of 'Spectroscope and Gemmology ', published 2006 under ISBN 9780943763521 and ISBN 0943763525.
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