John Sinkankas
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Gem Cutting: A Lapidary's Manual, 2nd Edition
Sinkankas, John
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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
John Sinkankas
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Gemstones of North America (v. 2: Gemstones of the world series)
John Sinkankas
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Gem Cutting a Lapidarys Manual Edition
Sinkankas, John
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Prospecting for Gemstones and Minerals
John Sinkankas
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Field Collecting Gemstones and Minerals
Sinkankas, John
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Standard Catalogue of Gem Values
John Sinkankas
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