The system of African rift valleys according to Eduard Suess, 1891
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The system of African rift valleys according to John Walter Gregory, 1920
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Morphology of the Ethiopian rift valley according to Oscar Neumann, 1901
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The Ethiopian rift valley according to John Walter Gregory, 1920
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Carta delle faglie del rift etiopico di Erich Krenkel del 1925
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Map of the main faults composing the Main Ethiopian Rift by Rudolf Schottenloher, 1938
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