Columbia subject headings:
Muslims--Iran--Khurāsān--History.
Muḥammad, Prophet, -632--Companions--Biography.
Muḥammad, Prophet, -632--Friends and associates.
Harvard subject headings:
Muḥammad, Prophet, -632--Companions--Biography.
Muḥammad, Prophet, -632--Friends and associates.
Muslims--Iran--Khurāsān--History.
Princeton subject headings: