Horseshoe curve from Altoona, Water Shed, Penna

Chicago citation style
Harry L. Sampson. Horseshoe curve from Altoona, Water Shed, Penna. July 25, 1947. Retrieved from the Digital Public Library of America, http://ark.cdlib.org/ark:/13030/kt429015sg. (Accessed December 15, 2018.)
APA citation style
Harry L. Sampson, (July 25, 1947) Horseshoe curve from Altoona, Water Shed, Penna. Retrieved from the Digital Public Library of America, http://ark.cdlib.org/ark:/13030/kt429015sg
MLA citation style
Harry L. Sampson. Retrieved from the Digital Public Library of America <http://ark.cdlib.org/ark:/13030/kt429015sg>.
Note: These citations are programmatically generated and may be incomplete.