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Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "Cameroons mountains and Bight of Biafra" The New York Public Library Digital Collections. 1850 - 1859. https://old-digitalcollections.nypl.org/items/8d434fb0-8122-013e-2623-0242ac110004
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "Cameroons mountains and Bight of Biafra" New York Public Library Digital Collections. Accessed October 17, 2026. https://old-digitalcollections.nypl.org/items/8d434fb0-8122-013e-2623-0242ac110004
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. (1850 - 1859). Cameroons mountains and Bight of Biafra Retrieved from https://old-digitalcollections.nypl.org/items/8d434fb0-8122-013e-2623-0242ac110004
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/8d434fb0-8122-013e-2623-0242ac110004 | title=
(cartographic)
Cameroons mountains and Bight of Biafra, (1850 - 1859)
|author=Digital Collections, The New York Public Library |accessdate=October 17, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>