Columbia subject headings:
Orthodox Eastern Church--Russia--History--Sources.
Orthodox Eastern Church--Soviet Union--History--Sources.
Russia--Church history--Sources.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Clergy--Sources.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History--Sources.
Soviet Union--Church history--Sources.
Tikhon, Patriarch of Moscow and All Russia, 1865-1925.
Harvard subject headings:
Canon law--Orthodox Eastern Church--Russia.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Russia--Sources.
Princeton subject headings:
Canon law--Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkov.
Orthodox Eastern Church--Soviet Union--Doctrines--History.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Doctrines--History--20th century.