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William Barstow

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Sulphurets What They Are, How Concentrated, How Assayed, and How Worked, with a Chapter on the Blow-Pipe Assay of Minerals (Classic Reprint)
Sulphurets What They Are, How Concentrated, How Assayed, and How Worked, with a Chapter on the Blow-Pipe Assay of Minerals (Classic Reprint)
Sulphurets What They Are, How Concentrated, How Assayed, and How Worked (1867)