Central board for the management of sawafi lands during the ‘Abbasid period (AD 750–945).
Al-’ard al-khassah
Al-mustakbirin
Al-thaman
Al-istihsan
Al-makhzan
Al-israf
Al-mustaghallat
Aqar
Al-khabalah
Ilm al-iqtisad al-Islami