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PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1850-02-09-_Vol_8_Iss_337_(IA_sim_economist_1850-02-09_8_337).pdf...
PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1854-06-24-_Vol_12_Iss_565_(IA_sim_economist_1854-06-24_12_565).pdf...
PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:The_Economist_1861-11-02-_Vol_19_Iss_949_(IA_sim_economist_1861-11-02_19_949).pdf...
The Engineering and Mining Journal 1893-02-11: Vol 55 Iss 6 ( ) Title The Engineering and Mining Journal 1893-02-11: Vol 55 Iss 6 Volume 55 Publisher...