Philosophical Transactions of the Royal Society. II. 233-326. This book, "Description of the Corundum Stone, and its Varieties, commonly known by the Names of Oriental Ruby, Sapphire, &c With Observations on Some Other Mineral Substances", by C. de Bournon, is a replication of a book originally published before 1802. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible.
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