| The Sultan's Yemen: 19th-Century Challenges to Ottoman Rule2 , p145 Caesar E | The Sultan's Yemen: 19th-Century Challenges to Ottoman Rule2 , p 204 Caesar E |
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| The Sultan's Yemen: 19th-Century Challenges to Ottoman Rule2 , p 205 Caesar E | A Collection of First World War Military Handbooks of Arabia, 1913-1917: The Arab Bureau handbooks of Hejaz, Asir, Yemen, page 40 |