| Georges Perrot, Professor in The Faculty of Letters, Paris; Member of The Institute, and Charles Chipiez | Al-Rehani: Nejd and its followers |
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| Lacey observes, "Forty is the number which bedouin often pick upon when they wish to describe a smallish body of men, and forty is the number of companions which Abdul Aziz is said to have had with him when he left Kuwait in September 1901 | Cambridge, England, UK: Cambridge University Press, 2002 |
Rank and file Ikhwan fighters formed units in a new military institution, initially the White Army, eventually the National Guard.
17| : , The Journal of Scriptural Reasoning, 2009 8 1 | British Relations with Trans-Jordan, 1920—1930 |
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| Commins, David Saudi Arabia 2009 | Adolf Grohmann, Arabia Volume 3, Issue 1, Part 3 p |