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WikiPedia: Union Pacific Railroad http://www.american-rails.com/union-pacific.html http://www.nyse.com/about/listed/lcddata.html?tick... http://www.railwaywondersoftheworld.com/north-amer... http://www.up.com/aboutup/corporate_info/uprrover/... http://www.uprr.com/aboutup/maps/sysmap.shtml http://www.uprr.com/aboutup/photos/ http://beinecke.library.yale.edu/digitallibrary/ru... http://www.library.yale.edu/beinecke/index.html //doi.org/10.2307%2F1883588 //www.jstor.org/stable/1883588