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The Nuttall Encyclopedia
A dynasty of 37 caliphs who ruled as such at Bagdad from 750 to 1258.
Wood, James, ed. Entry for 'Abbasides'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/a/abbasides.html. Frederick Warne & Co Ltd. London. 1900.