Gem Testing
By B. W. Anderson. Sixth edition, revised and reset. Pp. 324. (London: Heywood and Co., Ltd., 1958.) 42s. net.
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SMITH, W. [Book Reviews]. Nature 183, 781 (1959). https://doi.org/10.1038/183781a0
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DOI: https://doi.org/10.1038/183781a0