Robert Webster
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Gemmologists Compendium
Webster, Robert
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Practical Gemmology; A study of the identification of gem-stones, pearls and ornamental minerals [4th edition]
Webster, Robert
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Practical Gemmology - A Study of the Identification of Gem-Stones, Pearls and Ornamental Minerals
Webster, Robert
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Gemmologists' Compendium
Webster, Robert;Jobbins, E. Alan
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Gems: Their sources, descriptions, and identification
Webster, Robert F.G.A.
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