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Earth sciences --- Sciences de la terre --- Dictionaries --- Dictionnaires anglais

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Precious stones --- Pierres précieuses --- Museum of Practical Geology (Great Britain) --- Gem minerals --- Gemstones --- Jewels --- Semi-precious stones --- Stones, Precious --- Minerals --- Gemology --- Gems --- Catalogs and collections --- London. --- Institute of Geological Sciences (Great Britain). --- Geological Museum (Great Britain) --- Catalogs. --- Pierres précieuses.