John Sinkankas
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Gemstones of North America (v. 2: Gemstones of the world series)
John Sinkankas
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Gemstone & Mineral Data Book: A Compilation of Data, Recipes, Formulas, and Instructions for the Mineralogist, Gemologist, Lapidary, Jeweler, Craftsman and Collector
Sinkankas, John
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Field Collecting Gemstones and Minerals
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Prospecting for Gemstones and Minerals
John Sinkankas
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Van Nostrand's Standard Catalog of Gems
Sinkankas, John
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Standard Catalogue of Gem Values
John Sinkankas
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Gem Cutting: A Lapidary's Manual, 2nd Edition
John Sinkankas
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