Columbia subject headings:
Harvard subject headings:
Petropavlovskai︠a︡ krepostʹ (Saint Petersburg, Russia)--History.
Political prisoners--Soviet Union--History--19th century.
Princeton subject headings:
Alekseevskiĭ ravelin.
Political prisoners--Russia--Biography.
Revolutionaries--Russia--Biography.
Russia--History--1801-1917.
Saint Petersburg (Russia)--Biography.