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General Research Division, The New York Public Library. "Mechanical Treatise on Technique and Construction of the Series Nine Cars" The New York Public Library Digital Collections. 1913. https://old-digitalcollections.nypl.org/items/8e84b470-7fbf-013f-a0fe-0242ac110003
General Research Division, The New York Public Library. "Mechanical Treatise on Technique and Construction of the Series Nine Cars" New York Public Library Digital Collections. Accessed September 21, 2026. https://old-digitalcollections.nypl.org/items/8e84b470-7fbf-013f-a0fe-0242ac110003
General Research Division, The New York Public Library. (1913). Mechanical Treatise on Technique and Construction of the Series Nine Cars Retrieved from https://old-digitalcollections.nypl.org/items/8e84b470-7fbf-013f-a0fe-0242ac110003
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/8e84b470-7fbf-013f-a0fe-0242ac110003 | title=
(still image)
Mechanical Treatise on Technique and Construction of the Series Nine Cars, (1913)
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