Columbia subject headings:
Communists--Soviet Union--Correspondence.
Heads of state--Soviet Union--Correspondence.
Lenin, Vladimir Ilʹich, 1870-1924--Correspondence.
Revolutionaries--Soviet Union--Correspondence.
Harvard subject headings:
Communists--Soviet Union--Correspondence.
Heads of state--Soviet Union--Correspondence.
Lenin, Vladimir Ilʹich, 1870-1924--Correspondence.
Revolutionaries--Soviet Union--Correspondence
Princeton subject headings:
Lenin, Vladimir Ilʹich, 1870-1924.