Columbia subject headings:
Harvard subject headings:
Alchemy--Islamic Empire--History.
Khālid ibn Yazīd al-Umawī, active 7th century--Contributions in alchemy.
Science--Islamic Empire--History
Princeton subject headings:
Alchemy--Islamic Empire--History.
Khālid ibn Yazīd al-Umawī, active 7th century.
Science--Islamic Empire--History.