Columbia subject headings:
Prisoners--Soviet Union.
Shlisselʹburgskai︠a︡ ti︠u︡rʹma.
Harvard subject headings:
Prisoners--Soviet Union.
Shlisselʹburgskai︠a︡ ti︠u︡rʹma.
Princeton subject headings:
Prisoners--Soviet Union.
Shlisselʹburgskai︠a︡ ti︠u︡rʹma.