Columbia subject headings:
Shlisselʹburg prison, Russia.
Shlisselʹburgskai︠a︡ ti︠u︡rʹma.
Harvard subject headings:
Princeton subject headings:
Castles--Russia (Federation)
Fortification--Russia (Federation)
Novorusskiĭ, Mikhail Vasilʹevich, 1861-1925.
Prisons--Russia (Federation).
Shlisselʹburgskai︠a︡ ti︠u︡rʹma--History.