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The origins of the Islamic state : being a translation from the Arabic, accompanied with annotations, geographic and historic notes of the Kitâb futûḥ al-buldân of al-Imâm Abu-l ʿAbbâs, Aḥmad ibn-Jâbir al-Balâdhuri from books.google.com
This book is one of the most reliable sources on the beginnings of Islamic statehood.