Columbia subject headings:
Linguistics.
Linguists--Soviet Union--Correspondence.
Trubet︠s︡koĭ, Nikolaĭ Sergeevich, kni︠a︡zʹ, 1890-1938--Correspondence.
Harvard subject headings:
Linguistics.
Linguists--Soviet Union--Correspondence.
Trubet︠s︡koĭ, Nikolaĭ Sergeevich, kni︠a︡zʹ, 1890-1938--Correspondence.--Correspondence.
Princeton subject headings:
Linguistics.
Linguists--Soviet Union--Correspondence.
Trubet︠s︡koĭ, Nikolaĭ Sergeevich, kni︠a︡zʹ, 1890-1938--Correspondence.