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General Research Division, The New York Public Library. "Chionobas. III. 1-4. Ivallda; 5. Var.; a. Egg magnified; b, b-2. Larva (young) magnified; c. Egg of Iduna." The New York Public Library Digital Collections. 1888 - 1897. https://old-digitalcollections.nypl.org/items/510d47d9-6b96-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "Chionobas. III. 1-4. Ivallda; 5. Var.; a. Egg magnified; b, b-2. Larva (young) magnified; c. Egg of Iduna." New York Public Library Digital Collections. Accessed October 4, 2026. https://old-digitalcollections.nypl.org/items/510d47d9-6b96-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1888 - 1897). Chionobas. III. 1-4. Ivallda; 5. Var.; a. Egg magnified; b, b-2. Larva (young) magnified; c. Egg of Iduna. Retrieved from https://old-digitalcollections.nypl.org/items/510d47d9-6b96-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47d9-6b96-a3d9-e040-e00a18064a99 | title=
(still image)
Chionobas. III. 1-4. Ivallda; 5. Var.; a. Egg magnified; b, b-2. Larva (young) magnified; c. Egg of Iduna., (1888 - 1897)
|author=Digital Collections, The New York Public Library |accessdate=October 4, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>