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General Research Division, The New York Public Library. "The men who designed the new Liberty motorcycle motor watching an official test" The New York Public Library Digital Collections. https://digitalcollections.nypl.org/items/28dd0820-8d7f-013d-c7c8-0242ac110003
General Research Division, The New York Public Library. "The men who designed the new Liberty motorcycle motor watching an official test" New York Public Library Digital Collections. Accessed January 20, 2025. https://digitalcollections.nypl.org/items/28dd0820-8d7f-013d-c7c8-0242ac110003
General Research Division, The New York Public Library. The men who designed the new Liberty motorcycle motor watching an official test Retrieved from https://digitalcollections.nypl.org/items/28dd0820-8d7f-013d-c7c8-0242ac110003
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