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John Sinkankas
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Van Nostrand's standard catalog of gems
John Sinkankas · Van Nostrand Reinhold
286 sayfa · 1968
Catalogs / Collection and preservation / Gems / Precious stones
Emerald
Gunther Grundmann, Rupert Hochleitner, Lore Kiefert, Karl Schmetzer, John Sinkankas, Jeff Scovil, Roberto Appiani · Lapis International
100 sayfa · 2002
Beryl / Precious stones / Emeralds
Gemstone & mineral data book
John Sinkankas · Collier Books
352 sayfa · 1972
Gem cutting / Handbooks, manuals / Mineralogy / Minerals / Precious stones
Field Collecting Gemstones and Minerals
John Sinkankas · Echo Point Books & Media, LLC.
397 sayfa · 1988
Collection and preservation / Precious stones / Minerals / Geology - Field work / Minerals - Collecting of specimens