He visited central Kenya in 1893 and again in 1919 and his 1896 book The *Great Rift Valley* is considered a classic.

Note: I fixed a minor grammar error on the page prior to citing.

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Wikipedia contributors. (2024, January 14). John Walter Gregory. In Wikipedia, The Free Encyclopedia. Retrieved January 14, 2024, from https://en.wikipedia.org/w/index.php?title=John_Walter_Gregory&oldid=1195499176

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Discourse on the Method, part 4, ¶ 3-2

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John Walter Gregory (Wikipedia) John Walter Gregory, FRS, FRSE, FGS (27 January 1864 – 2 June 1932) was a British geologist and explorer, known principally for his work on glacial geology and on the geography and geology of Australia and East Africa.

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John Walter Gregory
Great Rift Valley
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