Columbia subject headings:
Poets, Russian--Correspondence.
Ti︠u︡tchev, F. I. (Fedor Ivanovich), 1803-1873--Correspondence.
Ti︠u︡tcheva, Ėrnestina Fedorovna, 1810-1894.
Harvard subject headings:
Poets, Russian--Correspondence.
Ti͡utchev, F. I. (Fedor Ivanovich), 1803-1873--Correspondence.
Ti︠u︡tcheva, Ė. F. (Ėrestina Fedorovna)
Princeton subject headings: