Albrecht, Harry P. World Famous Horseshoe Curve: Altoona Pennsylvania Railroad. Clifton Heights, PA: Harry P. Albrecht, 1973.
For further background information on the Horseshoe Curve, this pamphlet is recommended. Its availability may be limited however.
Citation Type: Book
Referenced in:
Altoona
Altoona Horseshoe Curve: A Vital Link