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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Graf Ferdinand von Zeppelin, Jugendbildnis. Mit GGenehmigung des Verlages von G. Knapp in Backenheim i. W." The New York Public Library Digital Collections. 1913. https://digitalcollections.nypl.org/items/3a1bbc10-5580-0133-cb13-00505686d14e
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Graf Ferdinand von Zeppelin, Jugendbildnis. Mit GGenehmigung des Verlages von G. Knapp in Backenheim i. W." New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/3a1bbc10-5580-0133-cb13-00505686d14e
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. (1913). Graf Ferdinand von Zeppelin, Jugendbildnis. Mit GGenehmigung des Verlages von G. Knapp in Backenheim i. W. Retrieved from https://digitalcollections.nypl.org/items/3a1bbc10-5580-0133-cb13-00505686d14e
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/3a1bbc10-5580-0133-cb13-00505686d14e | title=
(still image)
Graf Ferdinand von Zeppelin, Jugendbildnis. Mit GGenehmigung des Verlages von G. Knapp in Backenheim i. W., (1913)
|author=Digital Collections, The New York Public Library |accessdate=January 15, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>