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  • ^ 8.0 8.1 8.2 8.3 8.4 8.5 Howe, Ward Allan. A Century-Old Wonder of Railroading. The New York Times. February 14, 1954: (X25). 
  • ^ 9.0 9.1 Greenwood 1975,§ 7, p. 1.
  • ^ 10.0 10.1 10.2 Greenwood 1975,§ 8, p. 2.
  • ^ Greenwood 1975,§ 8, p. 1.
  • ^ Associated Press. Marvel of engineering celebrating milestone. Reading Eagle. June 30, 2004: (B10). 
  • ^ 13.0 13.1 Woods, Claire. Up and Down 'Round and 'Round and Back Again. Literary Map of Pennsylvania. Pennsylvania Center of the Book, Pennsylvania State University. Spring 2010 [May 29, 2012]. 
  • ^ 14.0 14.1 14.2 14.3 14.4 Cupper, Dan. Horseshoe Fascination. Trains (Kalmbach). 2004-08, 64 (8): 53. 
  • ^ Seidel 2008, pp. 18–19.
  • ^ 16.0 16.1 United States, 63rd Congress. Transportation of Coal: Hearings before the Subcommittee of the Committee on Naval Affairs United States Senate. Washington, DC: Government Printing Office. 1915: 367. 
  • ^ Seidel 2008, pp. 19, 25.
  • ^ Knight, Charles W. Flood Water Channel of the Reservoirs of Altoona, Pa. Engineering News and American Railway News. September 21, 1899, XLII (12): 200. 
  • ^ Altoona Has Solved Its Water Problems. Municipal Journal. December 4, 1913, XXXV (23): 771. 
  • ^ Seidel 2008, p. 43.
  • ^ Ely, Theo N; Watkins, J. Elfreth. Catalogue of the exhibit of the Pennsylvania Railroad Company at the World's Columbian Exposition. Chicago: Pennsylvania Railroad. 1893: 13. 
  • ^ 22.0 22.1 Seidel 2008, p. 113.
  • ^ Cohen 2002, p. 47.
  • ^ Cohen 2002, pp. 46–47.
  • ^ Cohen 2002, p. 53.
  • ^ Horseshoe Centenary. Life (Henry Luce). November 1, 1954: 37. 
  • ^ Stauffer 1962, p. 161.
  • ^ Stauffer 1962, p. 159.
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