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      Scientific American November 05, 1881

      On some Problems Arising in the Assay Office

      C. H. AaronTo Find the Weight of Gold in a Specimen of Gold in Quartz, Etc

      • By C. H. Aaron

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      More in the November 05, 1881 issue of Scientific American
      • Bands of the Rainbow
      • Improved Compound Engine
      • On the New Metal Actinium
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