Columbia subject headings:
Comparative linguistics--Congresses.
Indo-European languages--Congresses.
Indo-European philology--Congresses.
Indo-Europeans--Congresses.
Harvard subject headings:
Comparative linguistics--Congresses.
Indo-European languages--Congresses.
Indo-European philology--Congresses.
Indo-Europeans--Congresses.
Princeton subject headings:
Comparative linguistics--Congresses.
Indo-European languages--Congresses.
Indo-European philology--Congresses.
Indo-Europeans--Congresses.