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PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1853-04-16-_Vol_11_Iss_503_(IA_sim_economist_1853-04-16_11_503).pdf...
PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1871-04-08-_Vol_29_Iss_1441_(IA_sim_economist_1871-04-08_29_1441).pdf...
PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1886-04-03-_Vol_44_Iss_2223_(IA_sim_economist_1886-04-03_44_2223).pdf...
PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1887-06-25-_Vol_45_Iss_2287_(IA_sim_economist_1887-06-25_45_2287).pdf...
The Engineering and Mining Journal 1887-03-26: Vol 43 Iss 13 ( ) Title The Engineering and Mining Journal 1887-03-26: Vol 43 Iss 13 Volume 43 Publisher...