Columbia subject headings:
Communist state--Congresses.
Lenin, Vladimir Il'ich, 1870-1924--Congresses.
Harvard subject headings:
Communist state--Congresses.
Lenin, Vladimir Ilʹich, 1870-1924--Congresses.
Princeton subject headings:
Communist state--Congresses.
Lenin, Vladimir Ilʹich, 1870-1924--Congresses.