Columbia subject headings:
Harvard subject headings:
India--Religion.
Indo-Aryans.
Indo-Iranian languages--Etymology--Names.
Indo-Iranians.
Iran--Religion.
Middle East--Historical geography.
Vedas. R̥gveda--Criticism, interpretation, etc.
Princeton subject headings:
Avesta.
Indo-Europeans.
Middle East--Historical geography.
Vedas. R̥gveda