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General Research Division, The New York Public Library. "Wilfrid de Fonvielle prononçant une conférence sur l'aérostation. Tableau de Mlle Klumpke (1899)." The New York Public Library Digital Collections. 1905. https://digitalcollections.nypl.org/items/627f55fd-5cc8-2cae-e040-e00a18062420
General Research Division, The New York Public Library. "Wilfrid de Fonvielle prononçant une conférence sur l'aérostation. Tableau de Mlle Klumpke (1899)." New York Public Library Digital Collections. Accessed January 28, 2025. https://digitalcollections.nypl.org/items/627f55fd-5cc8-2cae-e040-e00a18062420
General Research Division, The New York Public Library. (1905). Wilfrid de Fonvielle prononçant une conférence sur l'aérostation. Tableau de Mlle Klumpke (1899). Retrieved from https://digitalcollections.nypl.org/items/627f55fd-5cc8-2cae-e040-e00a18062420
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/627f55fd-5cc8-2cae-e040-e00a18062420 | title=
(still image)
Wilfrid de Fonvielle prononçant une conférence sur l'aérostation. Tableau de Mlle Klumpke (1899)., (1905)|author=Digital Collections, The New York Public Library |accessdate=January 28, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>