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John Sinkankas

John Sinkankas

No biography available.

Works (7)

Cover of Mineralogy

Cover of Gem cutting

Cover of Van Nostrand's standard catalog of gems

Van Nostrand's standard catalog of gems

Cover of Gemology

Cover of Gemstones of North America

Gemstones of North America

Cover of Emerald and other beryls

Emerald and other beryls

Cover of Emerald

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