Columbia subject headings:
Harvard subject headings:
Afghanistan--Foreign relations--Soviet Union--Sources.
Soviet Union--Foreign relations--1917-1945--Sources.
Soviet Union--Foreign relations--1945-1991--Sources.
Soviet Union--Foreign relations--Afghanistan--Sources.
Princeton subject headings:
Afghanistan--Foreign relations--Soviet Union--Sources.
Soviet Union--Foreign relations--1917-1945--Sources.
Soviet Union--Foreign relations--1945-1991--Sources.
Soviet Union--Foreign relations--Afghanistan--Sources.