Columbia subject headings:
Lenin, Vladimir Ilʹich, 1870-1924--Political activity.
Lenin, Vladimir Ilʹich, 1870-1924--Travel--Belgium.
Lenin, Vladimir Ilʹich, 1870-1924--Travel--Denmark.
Lenin, Vladimir Ilʹich, 1870-1924--Travel--France.
Harvard subject headings:
Lenin, Vladimir Ilʹich, 1870-1924--Journeys--Belgium.
Lenin, Vladimir Ilʹich, 1870-1924--Journeys--Denmark.
Lenin, Vladimir Ilʹich, 1870-1924--Journeys--France.
Lenin, Vladimir Ilʹich, 1870-1924--Political career before 1917.
Princeton subject headings: