Columbia subject headings:
Afghanistan--Politics and government--Congresses.
Afghanistan--Social life and customs--Congresses.
Iran--Politics and government--Congresses.
Iran--Social life and customs--Congresses.
Tribes--Afghanistan--Congresses.
Tribes--Iran--Congresses.
Harvard subject headings:
Afghanistan--Politics and government--Congresses.
Afghanistan--Social life and customs--Congresses.
Iran--Politics and government--Congresses.
Iran--Social life and customs--Congresses.
Tribes--Afghanistan--Congresses.
Tribes--Iran--Congresses.
Princeton subject headings:
Afghanistan--Politics and government--Congresses.
Afghanistan--Social life and customs--Congresses.
Iran--Politics and government--Congresses.
Iran--Social life and customs--Congresses.
Tribes--Afghanistan--Congresses.
Tribes--Iran--Congresses.