Ch. 3: Precious Gem stones in 1886

• Ch. 1: Gold, Silver in 1886
• Ch. 2: Platinum in 1886
• Ch. 3: Gemstones in 1886

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• Louderback. Benitoite.
• Neptunite Description
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• Williams: Diamond Mines South Africa II
• Ch.17: Diamond Market
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• US Geol. Surv. 1893. Gemstones, Metals.
• Ch. 2: Gemstones in 1893
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• US Geol. Surv. 1918. Gemstones, Metals.
• Ch. 3: Gemstones in 1918
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• US Geol. Surv. 1919. Gemstones, Metals.
• Ch. 3: Gemstones in 1919
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• US Geol. Surv. 1920. Gemstones, Metals.
• Ch. 3: Gemstones in 1920
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• US Geol. Surv. 1891. Gemstones, Metals.
• Ch. 2: Gemstones in 1891
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• US Geol. Surv. 1893. Gemstones, Metals.
• US Geol. Surv. 1883-84. Gemstones, Metals.
• US Geol. Surv. 1892. Gemstones, Metals.

Deposits Diamond Gemological Properties Gemstones Gold History Mine Mining Production USA

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