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General Research Division, The New York Public Library. "No. 81. Hypothetical section illustrating the denudation of the Weald Valley and the contemporaneous origin of the Eocene strata." The New York Public Library Digital Collections. 1830 - 1833. https://qa-digitalcollections.nypl.org/items/510d47dd-ce71-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "No. 81. Hypothetical section illustrating the denudation of the Weald Valley and the contemporaneous origin of the Eocene strata." New York Public Library Digital Collections. Accessed November 25, 2024. https://qa-digitalcollections.nypl.org/items/510d47dd-ce71-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1830 - 1833). No. 81. Hypothetical section illustrating the denudation of the Weald Valley and the contemporaneous origin of the Eocene strata. Retrieved from https://qa-digitalcollections.nypl.org/items/510d47dd-ce71-a3d9-e040-e00a18064a99
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(still image)
No. 81. Hypothetical section illustrating the denudation of the Weald Valley and the contemporaneous origin of the Eocene strata., (1830 - 1833)
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