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General Research Division, The New York Public Library. "Motor supported from three points under ideal and abnormal conditions; Drawing shows the advantage of three-point suspension; Motor supported from four points under ideal and abnormal conditions; Drawing shows the disadvantage of four-point suspension." The New York Public Library Digital Collections. 1903 - 1916. https://old-digitalcollections.nypl.org/items/510d47de-07a2-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Motor supported from three points under ideal and abnormal conditions; Drawing shows the advantage of three-point suspension; Motor supported from four points under ideal and abnormal conditions; Drawing shows the disadvantage of four-point suspension." New York Public Library Digital Collections. Accessed October 2, 2026. https://old-digitalcollections.nypl.org/items/510d47de-07a2-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1903 - 1916). Motor supported from three points under ideal and abnormal conditions; Drawing shows the advantage of three-point suspension; Motor supported from four points under ideal and abnormal conditions; Drawing shows the disadvantage of four-point suspension. Retrieved from https://old-digitalcollections.nypl.org/items/510d47de-07a2-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47de-07a2-a3d9-e040-e00a18064a99 | title=
(still image)
Motor supported from three points under ideal and abnormal conditions; Drawing shows the advantage of three-point suspension; Motor supported from four points under ideal and abnormal conditions; Drawing shows the disadvantage of four-point suspension., (1903 - 1916)
|author=Digital Collections, The New York Public Library |accessdate=October 2, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>