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    Improved Hotel Annunciator, Making Steel from Iron with Gas

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    Metallurgy of Copper and Zinc

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    History of the Heliographic Art in Europe and America

    By M. A. Root

    The Explosion of Gunpowder

    Professor Agassiz in Brooklyn

    Malleableizing Cast Iron

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    February 15, 1862

    See the World from a Different Perspective

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