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Humble creatures; part I. The earthworm, and the common housefly. In eight letters
General Research Division, The New York Public Library. "To William Spence, Esq., F.R.S., F.L.S...." The New York Public Library Digital Collections. 1860. https://qa-digitalcollections.nypl.org/items/510d47da-6707-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "To William Spence, Esq., F.R.S., F.L.S...." New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-6707-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1860). To William Spence, Esq., F.R.S., F.L.S.... Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-6707-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47da-6707-a3d9-e040-e00a18064a99 | title=
(text)
To William Spence, Esq., F.R.S., F.L.S...., (1860)
|author=Digital Collections, The New York Public Library |accessdate=November 25, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>