Columbia subject headings:
Czechoslovakia--Foreign relations--Soviet Union.
Czechoslovakia--Politics and government.
Soviet Union--Foreign relations--Czechoslovakia.
Harvard subject headings:
Czechoslovakia--Foreign relations--Soviet Union.
Czechoslovakia--Politics and government.
Soviet Union--Foreign relations--Czechoslovakia.
Princeton subject headings:
Czechoslovakia--Foreign relations--Soviet Union.
Czechoslovakia--Politics and government.
Soviet Union--Foreign relations--Czechoslovakia.