Columbia subject headings:
Old Believers--History.
Russia--Church history--17th century.
Harvard subject headings:
Old Believers--History.
Russia--Church history--17th century.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History--17th century.
Princeton subject headings:
Old Believers--History--Sources.
Russia--Church history--17th century--Sources.