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George Arents Collection, The New York Public Library. "Do you know why birds' eggs vary in colour and shape?" The New York Public Library Digital Collections. 1850 - 1959. https://qa-digitalcollections.nypl.org/items/510d47e2-1cd9-a3d9-e040-e00a18064a99
George Arents Collection, The New York Public Library. "Do you know why birds' eggs vary in colour and shape?" New York Public Library Digital Collections. Accessed December 23, 2024. https://qa-digitalcollections.nypl.org/items/510d47e2-1cd9-a3d9-e040-e00a18064a99
George Arents Collection, The New York Public Library. (1850 - 1959). Do you know why birds' eggs vary in colour and shape? Retrieved from https://qa-digitalcollections.nypl.org/items/510d47e2-1cd9-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47e2-1cd9-a3d9-e040-e00a18064a99 | title=
(still image)
Do you know why birds' eggs vary in colour and shape?, (1850 - 1959)
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