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PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1881-06-25-_Vol_39_Iss_1974_(IA_sim_economist_1881-06-25_39_1974).pdf...
The Engineering and Mining Journal 1896-05-02: Vol 61 Iss 18 ( ) Title The Engineering and Mining Journal 1896-05-02: Vol 61 Iss 18 Volume 61 Publisher...