Columbia subject headings:
Afghanistan--History--Soviet occupation, 1979-1989--Causes.
Afghanistan--Politics and government--1973-1989.
Najib, 1947-1996.
Harvard subject headings:
Afghanistan--Foreign relations--Soviet Union.
Afghanistan--History--Soviet occupation, 1979-1989--Sources.
Afghanistan--Politics and government--1973-1989.
Karmal, Babrak.
Najib, 1947-
Soviet Union--Foreign relations--Afghanistan.
Princeton subject headings: