Columbia subject headings:
Avestan language--Congresses.
Iran--Civilization--Congresses.
Iranian languages, Middle--Congresses.
Iranian languages--Congresses.
Iranian literature--History and criticism--Congresses.
Iranian philology--Congresses.
Old Persian language--Congresses.
Pahlavi language--Congresses.
Sogdian language--Congresses.
Syriac language--Congresses.
Harvard subject headings:
Avestan language--Congresses.
Iran--Civilization--Congresses.
Iranian languages, Middle--Congresses.
Iranian languages--Congresses.
Iranian literature--History and criticism--Congresses.
Iranian philology--Congresses.
Old Persian language--Congresses.
Pahlavi language--Congresses.
Sogdian language--Congresses.
Syriac language--Congresses.
Princeton subject headings:
Avestan language--Congresses.
Iran--Civilization--Congresses.
Iranian languages, Middle--Congresses.
Iranian languages--Congresses.
Iranian literature--History and criticism--Congresses.
Iranian philology--Congresses.
Old Persian language--Congresses.
Pahlavi language--Congresses.
Sogdian language--Congresses.
Syriac language--Congresses.