Columbia subject headings:
Abū Yūsuf Yaʻqūb, 731 or 732-798. Kharāj.
Real property tax (Islamic law)--Iraq.
Real property tax--Islamic Empire.
Tithes (Islamic law)--Iraq.
Harvard subject headings:
Abū Yūsuf Yaʻqūb, 731 or 732-798. Kharāj.
Real property tax (Islamic law)--Iraq.
Real property tax--Islamic Empire.
Tithes (Islamic law)--Iraq.
Princeton subject headings: