Columbia subject headings:
Astronomy--Islamic Empire--History--Congresses.
Khuwārizmī, Muḥammad ibn Mūsá, active 813-846--Congresses.
Science--Islamic Empire--History--Congresses.
Harvard subject headings:
Astronomy--Islamic Empire--History--Congresses.
Khuwārizmī, Muḥammad ibn Mūsá, active 813-846--Congresses.
Science--Islamic Empire--History--Congresses.
Princeton subject headings:
Astronomy--Islamic Empire--History--Congresses.
Khuwārizmī, Muḥammad ibn Mūsá, active 813-846--Congresses.
Science--Islamic Empire--History--Congresses.