Columbia subject headings:
Harvard subject headings:
Morozova, Feodosii͡a Prokofʹevna Sokovnina, 1632-1675.
Old Believers.
Princeton subject headings:
Avvakum Petrovich, Protopope, 1620 or 1621-1682--Correspondence.
Morozova, Feodosii︠a︡ Prokofʹevna Sokovnina, 1632-1675--Correspondence.
Morozova, Feodosii︠a︡ Prokofʹevna Sokovnina, 1632-1675.
Old Believers.
Urusova, Evdokii︠a︡ Prokopʹevna, kni︠a︡gini︠a︡, -1675--Correspondence.