Columbia subject headings:
Cold War--Fiction.
Intelligence officers--England--Fiction.
Intelligence service--Great Britain--Fiction.
Smiley, George (Fictitious character)--Fiction.
Thrillers (Fiction)
Harvard subject headings:
Cold War--Fiction
Great Britain. MI6--Fiction.
Intelligence officers--England--Fiction.
Intelligence officers--Fiction.
Intelligence service--Great Britain--Fiction.
Novels.
Smiley, George (Fictitious character)--Fiction.
Spy fiction.
Spy stories.
Thrillers (Fiction)
Princeton subject headings:
Fiction.
Intelligence officers--Fiction.
Novels.
Spy stories.