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PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1857-06-06-_Vol_15_Iss_719_(IA_sim_economist_1857-06-06_15_719).pdf...
The Engineering and Mining Journal 1879-01-25: Vol 27 Iss 4 ( ) Title The Engineering and Mining Journal 1879-01-25: Vol 27 Iss 4 Volume 27 Publisher...