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  1. 1
    Proceedings of the second Pan American scientific congress : the prospect for marketing South American zinc ore /

    Proceedings of the second Pan American scientific congress : the prospect for marketing South American zinc ore / by Ingalls, W. R.

    Article
  2. 2
    Congreso Científico Panamericano (2 : 1915-1916 : Washington).

    Congreso Científico Panamericano (2 : 1915-1916 : Washington).

    Published 1917
    Conference Proceeding Book

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