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© The New York Public Library, 2024
The New York Public Library is a 501(c)(3) | EIN 13-1887440
October 4, 1911; Hydro-aeroplane mail service; Minneapolis, Minn. by aviator Robinson.
Manuscripts and Archives Division, The New York Public Library. "1911 Minneapolis, Minnesota - Rock Island, Ill. - Mississippi River flight cover" The New York Public Library Digital Collections. 1911-10-17 - 1911-10-20. https://digitalcollections.nypl.org/items/510d47e3-b183-a3d9-e040-e00a18064a99
Manuscripts and Archives Division, The New York Public Library. "1911 Minneapolis, Minnesota - Rock Island, Ill. - Mississippi River flight cover" New York Public Library Digital Collections. Accessed April 27, 2024. https://digitalcollections.nypl.org/items/510d47e3-b183-a3d9-e040-e00a18064a99
Manuscripts and Archives Division, The New York Public Library. (1911-10-17 - 1911-10-20). 1911 Minneapolis, Minnesota - Rock Island, Ill. - Mississippi River flight cover Retrieved from https://digitalcollections.nypl.org/items/510d47e3-b183-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47e3-b183-a3d9-e040-e00a18064a99 | title=
(still image)
1911 Minneapolis, Minnesota - Rock Island, Ill. - Mississippi River flight cover, (1911-10-17 - 1911-10-20)
|author=Digital Collections, The New York Public Library |accessdate=April 27, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>