Columbia subject headings:
Harvard subject headings:
Balkan Peninsula--Foreign relations--Germany.
Balkan Peninsula--Foreign relations--Soviet Union.
Germany--Foreign relations--Balkan Peninsula.
Germany--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Balkan Peninsula.
Soviet Union--Foreign relations--Germany.
Princeton subject headings:
Balkan Peninsula--Foreign relations--Germany.
Balkan Peninsula--Foreign relations--Soviet Union.
Germany--Foreign relations--Balkan Peninsula.
Germany--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Balkan Peninsula.
Soviet Union--Foreign relations--Germany.