Bing found the following results
Abbasid Caliphate - Wikipedia
Abbasid caliphate | Achievements, Capital, & Facts | Britannica
Abbasid Dynasty - World History Encyclopedia
Abbasid dynasty - Wikipedia
From Splendor to Ruin: The Epic Tale of the Abbasid Caliphate
Caliphate - Abbasid, Islamic Empire, Sunni | Britannica
The golden age of Islam (article) | Khan Academy
The Abbasid Caliphate | Islamic History
Abbasid Caliphate - Islamic Studies - Oxford Bibliographies
Caliphate | History, Empire, Meaning, & Definition | Britannica
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