impurities

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On the torbanite or Kerosene Shale of New South Wales
A. Liversidge

American Journal of Science July 1881, s3-22 (127) 32; DOI: https://doi.org/10.2475/ajs.s3-22.127.32
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Arsenic as an impurity of metallic zinc
Chas. W. Eliot and Frank H. Storer

American Journal of Science November 1861, s2-32 (96) 380-394; DOI: https://doi.org/10.2475/ajs.s2-32.96.380
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Contributions to the history of picric acid
M. Carey Lea

American Journal of Science September 1861, s2-32 (95) 180-183; DOI: https://doi.org/10.2475/ajs.s2-32.95.180

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