Columbia subject headings:
Afghanistan--Foreign relations--20th century.
Afghanistan--History.
Afghanistan--Politics and government.
Political science--Afghanistan--History.
Ḥizb-i Dimūkrātīk-i Khalq-i Afghānistān.
Harvard subject headings:
Afghanistan--Foreign relations--20th century.
Afghanistan--History
Afghanistan--Politics and government
Ḥizb-i Dimūkrātīk-i Khalq-i Afghānistān
Political science--Afghanistan--History.
Princeton subject headings:
Afghanistan--Foreign relations--20th century.
Afghanistan--History.
Afghanistan--Politics and government.
Ḥizb-i Dimūkrātīk-i Khalq-i Afghānistān.
Political science--Afghanistan--History.