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Through the sun in an airship

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Credits: Tim Lindell, Robert Tonsing, and the Online Distributed Proofreading Team at https: //www. pgdp. net (This book was produced from images made available by the HathiTrust Digital Library. )

About the Author

Mastin, John portrait

John Mastin

John Mastin was an author known for his contributions to the field of gemology. His notable work, "The Chemistry, Properties and Tests of Precious Stones," provides an in-depth examination of the scientific aspects of precious stones, including their chemical composition and physical properties. Mastin's writing reflects a blend of scientific inquiry and practical knowledge, making it a valuable resource for both gem enthusiasts and professionals in the field. His work contributes to the understanding of gemstones and their significance in various contexts.

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