Columbia subject headings:
Harvard subject headings:
Abbasids.
Extinct cities--Iraq
Iraq--History--634-1534.
Iraq--Intellectual life.
ʻUkbarā (Extinct city)--Intellectual life.
ʻUkbarā (Extinct city)--Iraq--History.
Princeton subject headings:
Abbasids.
Extinct cities--Iraq.
Iraq--History--634-1534.
Iraq--Intellectual life.
ʻUkbarā (Extinct city)--Intellectual life.
ʻUkbarā (Extinct city)--Iraq--History.