Columbia subject headings:
Czechoslovakia--Foreign relations--Soviet Union.
Slovakia--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Czechoslovakia.
Soviet Union--Foreign relations--Slovakia.
Harvard subject headings:
Czechoslovakia--Foreign relations--Soviet Union.
Slovakia--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Czechoslovakia.
Soviet Union--Foreign relations--Slovakia.
Princeton subject headings:
Czechoslovakia--Foreign relations--Soviet Union.
Slovakia--Foreign relations--Soviet Union.
Soviet Union--Foreign relations--Czechoslovakia.
Soviet Union--Foreign relations--Slovakia.