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Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "Sketch Map showing the principal journeys of the Rev. Geo. Grenfell in the Congo region & co. " The New York Public Library Digital Collections. 1908. https://digitalcollections.nypl.org/items/510d47dd-fc56-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. "Sketch Map showing the principal journeys of the Rev. Geo. Grenfell in the Congo region & co. " New York Public Library Digital Collections. Accessed March 24, 2025. https://digitalcollections.nypl.org/items/510d47dd-fc56-a3d9-e040-e00a18064a99
Schomburg Center for Research in Black Culture, Jean Blackwell Hutson Research and Reference Division, The New York Public Library. (1908). Sketch Map showing the principal journeys of the Rev. Geo. Grenfell in the Congo region & co. Retrieved from https://digitalcollections.nypl.org/items/510d47dd-fc56-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47dd-fc56-a3d9-e040-e00a18064a99 | title=
(cartographic)
Sketch Map showing the principal journeys of the Rev. Geo. Grenfell in the Congo region & co. , (1908)
|author=Digital Collections, The New York Public Library |accessdate=March 24, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>