Columbia subject headings:
Atheism--Czechoslovakia--History--20th century.
Atheism--Soviet Union--History--20th century.
Czechoslovakia--Religion.
Soviet Union--Religion.
Harvard subject headings:
Atheism--Czechoslovakia--History--20th century.
Atheism--Soviet Union--History--20th century.
Czechoslovakia--Religion.
Soviet Union--Religion
Princeton subject headings:
Atheism--Czechoslovakia--History--20th century.
Atheism--Soviet Union--History--20th century.
Czechoslovakia--Religion.
Soviet Union--Religion.