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© The New York Public Library, 2026
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General Research Division, The New York Public Library. "No. 33. Section of part of Little Cat cliff, composed of quartzose sand, showing the inclination of thye layers in opposite directions. ; No. 34 Lamination of shelly sand and loam, near the Signal-house, Walton. Vertical height four feet." The New York Public Library Digital Collections. 1830 - 1833. https://old-digitalcollections.nypl.org/items/510d47dd-ce98-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. "No. 33. Section of part of Little Cat cliff, composed of quartzose sand, showing the inclination of thye layers in opposite directions. ; No. 34 Lamination of shelly sand and loam, near the Signal-house, Walton. Vertical height four feet." New York Public Library Digital Collections. Accessed October 8, 2026. https://old-digitalcollections.nypl.org/items/510d47dd-ce98-a3d9-e040-e00a18064a99
General Research Division, The New York Public Library. (1830 - 1833). No. 33. Section of part of Little Cat cliff, composed of quartzose sand, showing the inclination of thye layers in opposite directions. ; No. 34 Lamination of shelly sand and loam, near the Signal-house, Walton. Vertical height four feet. Retrieved from https://old-digitalcollections.nypl.org/items/510d47dd-ce98-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47dd-ce98-a3d9-e040-e00a18064a99 | title=
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No. 33. Section of part of Little Cat cliff, composed of quartzose sand, showing the inclination of thye layers in opposite directions. ; No. 34 Lamination of shelly sand and loam, near the Signal-house, Walton. Vertical height four feet., (1830 - 1833)
|author=Digital Collections, The New York Public Library |accessdate=October 8, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>