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General Research Division, The New York Public Library. "1. 1a. 1b. 1c. 1d. 1e. Oursin déprimé, Echinus depressus; 2. 2a. Détails de l'Oursin poreux, Echinus porosus." The New York Public Library Digital Collections. 1840 - 1864. https://digitalcollections.nypl.org/items/510d47da-6cdf-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "1. 1a. 1b. 1c. 1d. 1e. Oursin déprimé, Echinus depressus; 2. 2a. Détails de l'Oursin poreux, Echinus porosus." New York Public Library Digital Collections. Accessed May 2, 2024. https://digitalcollections.nypl.org/items/510d47da-6cdf-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1840 - 1864). 1. 1a. 1b. 1c. 1d. 1e. Oursin déprimé, Echinus depressus; 2. 2a. Détails de l'Oursin poreux, Echinus porosus. Retrieved from https://digitalcollections.nypl.org/items/510d47da-6cdf-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-6cdf-a3d9-e040-e00a18064a99 | title=
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1. 1a. 1b. 1c. 1d. 1e. Oursin déprimé, Echinus depressus; 2. 2a. Détails de l'Oursin poreux, Echinus porosus., (1840 - 1864)
|author=Digital Collections, The New York Public Library |accessdate=May 2, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>