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Dow Jones & Co, 2003, Dow Jones & Co website

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Frontier Trails of the Old West, 2003, frontiertrails.com

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Logging Railroads of Mississippi, 2002, www.datasync.com/~dhbjda/, now removed

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Minnesota Historical Society, 2000, item in collection

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Pennsylvania Railroad Technical & Historical Society, 2002, broadway.pennsyrr.com

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Smithsonian Institution, 2017, Smithsonian Institution electronic records, website

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Toronto Public Library, 2015, Toronto Public Library website

Trains Magazine, 2003, Kalmbach Publishing web site

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Union Pacific Historical Society, 1999, web site

Universal Exposition, 1904, Official Catalogue of Exhibitors, Universal Exposition, St Louis

University of Connecticut Dodd Research Center, 2001, web site listing of New York New Haven & Hartford Railroad archives

Walkersville Southern Railroad, 1999, web site

Washington State Railroads Historical Society, 2003, Washington State Railroads Historical Society web site

webroots.org, 2003, History of Nebraska, web site, webroots.org

Western Pacific Railroad Historical Society, 2006, web site

Wisconsin Central Transportation Corp, 1999, web site

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Wyoming, State of, 2001, web site, listing of corporations

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Cox, Terry, 1997, Union Pacific/Southern Pacific map scanning project

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Gibson County Tennessee Historical Society, Sep 18, 2021, Gibson County Tennessee Historical Society Facebook illustration

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Philadelphia Rapid Transit System Corporate Organization Chart, 1935, Philadelphia Rapid Transit System