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Schomburg Center for Research in Black Culture, Manuscripts, Archives and Rare Books Division, The New York Public Library. "Lake Ngami: Discovered by Oswell, Murray & Livingstone. From a drawing made on the spot 1850, by the late Alfred Ryder, Esq." The New York Public Library Digital Collections. 1857. https://digitalcollections.nypl.org/items/510d47da-6d79-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Manuscripts, Archives and Rare Books Division, The New York Public Library. "Lake Ngami: Discovered by Oswell, Murray & Livingstone. From a drawing made on the spot 1850, by the late Alfred Ryder, Esq." New York Public Library Digital Collections. Accessed February 6, 2025. https://digitalcollections.nypl.org/items/510d47da-6d79-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Manuscripts, Archives and Rare Books Division, The New York Public Library. (1857). Lake Ngami: Discovered by Oswell, Murray & Livingstone. From a drawing made on the spot 1850, by the late Alfred Ryder, Esq. Retrieved from https://digitalcollections.nypl.org/items/510d47da-6d79-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47da-6d79-a3d9-e040-e00a18064a99 | title=
(still image)
Lake Ngami: Discovered by Oswell, Murray & Livingstone. From a drawing made on the spot 1850, by the late Alfred Ryder, Esq., (1857)
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