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Cox, L. R. (1933). A lower Tertiary siliceous rock from the Anglo-Egyptian Sudan. Bulletin de l'Institut d'Égypte. 15 (2): 315-348.
Cox, L. R. (1933). A lower Tertiary siliceous rock from the Anglo-Egyptian Sudan. Bulletin de l'Institut d'Égypte. 15 (2): 315-348.