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The geology and geography of Northern Nigeria

Note 56 — Chapter III

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Gentil, C. Rd. Ac. Sc., 8 Aug., 1904; Foureau and Gentil, C. Rd. Ac. Sc., 2 Jan., 1905; Lacroix, C. Rd. Ac. Sc., 1 May, 1905; Gentil, Doc. Sc. Miss. Sah., 1905, p. 697.

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