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
John Sinkankas
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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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Gem Cutting: A Lapidary's Manual, 2nd Edition
John Sinkankas
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Gem Cutting a Lapidarys Manual Edition
Sinkankas, John
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