GEORGE SALIBA. THE HISTORY OF AL—ṬABARÍ (TĀRĪKH AL—RUSUL WA'L—MULŪK), VOLUME XXVII, THE ABBASID REVOLUTION by JOHN ALDEN WILLIAMS;THE HISTORY OF AL—ṬABARĪ (TĀRĪKH—AL—RUSUL WA'L—MULŪK), VOL. XXXV, THE CRISIS OF THE 'ABBASID CALIPHATE

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