Columbia subject headings:
Afroasiatic languages--Congresses.
Afroasiatic languages--Grammar, Comparative--Indo-European--Congresses.
Indo-European languages--Grammar, Comparative--Afroasiatic--Congresses.
Harvard subject headings:
Afroasiatic languages--Congresses.
Afroasiatic languages--Grammar, Comparative--Indo-European--Congresses.
Indo-European languages--Grammar, Comparative--Afroasiatic--Congresses.
Princeton subject headings:
Afroasiatic languages--Congresses.
Afroasiatic languages--Grammar, Comparative--Indo-European--Congresses.
Indo-European languages--Congresses.
Indo-European languages--Grammar, Comparative--Afroasiatic--Congresses.