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PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1890-01-11-_Vol_48_Iss_2420_(IA_sim_economist_1890-01-11_48_2420).pdf...
PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1880-02-14-_Vol_38_Iss_1903_(IA_sim_economist_1880-02-14_38_1903).pdf...
The Engineering and Mining Journal 1895-12-07: Vol 60 Iss 23 ( ) Title The Engineering and Mining Journal 1895-12-07: Vol 60 Iss 23 Volume 60 Publisher...