Columbia subject headings:
Indo-Iranian languages--Syntax--Congresses.
Harvard subject headings:
Avestan language--Syntax--Congresses.
Indo-Iranian languages--Syntax--Congresses.
Vedic language--Syntax--Congresses.
Princeton subject headings:
Avestan language--Syntax--Congresses.
Indo-Iranian languages--Syntax--Congresses.
Vedic language--Syntax--Congresses.