Columbia subject headings:
Daniėlʹ, I︠U︡liĭ, 1925-1988--Correspondence.
Harvard subject headings:
Daniėlʹ, I︠U︡liĭ, 1925---Correspondence.
Dissenters--Soviet Union--Biography
Political persecution--Soviet Union
Political prisoners--Soviet Union--Biography
Political prisoners--Soviet Union--Correspondence
Princeton subject headings:
Daniėlʹ, I︠U︡liĭ, 1925-1988--Correspondence.