Columbia subject headings:
Harvard subject headings:
Atomic bomb--Soviet Union.
Espionage--Soviet Union.
Intelligence service--Soviet Union.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti.
Princeton subject headings:
Fiction.
Intelligence service--Soviet Union--Fiction.
Soviet Union. Komitet gosudarstvennoĭ bezopasnosti--Fiction.
Spies--Soviet Union--Fiction.