Columbia subject headings:
Rome--Administrative and political divisions--Sources.
Tadmur (Syria)--History--Sources.
Harvard subject headings:
Palmyra--History--Sources.
Rome--Foreign relations--30 B.C.-476 A.D.
Şanlıurfa (Turkey)--History--Sources.
Princeton subject headings:
Palmyra--History--Sources.
Rome--Administrative and political divisions--Sources.