Famous Horse Shoe Curve on main line, Pennsylvania Railroad, near Altoona, Pa

Chicago citation style
Famous Horse Shoe Curve on main line, Pennsylvania Railroad, near Altoona, Pa. 1930-1945. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/4b29b758v. (Accessed June 25, 2018.)
APA citation style
(1930-1945) Famous Horse Shoe Curve on main line, Pennsylvania Railroad, near Altoona, Pa. Retrieved from the Digital Public Library of America, http://ark.digitalcommonwealth.org/ark:/50959/4b29b758v
MLA citation style
Retrieved from the Digital Public Library of America <http://ark.digitalcommonwealth.org/ark:/50959/4b29b758v>.
Note: These citations are programmatically generated and may be incomplete.