Columbia subject headings:
Anarchism--History--19th century.
Anarchists--Soviet Union--Biography.
Kropotkin, Petr Alekseevich, kni︠a︡zʹ, 1842-1921.
Harvard subject headings:
Anarchism.
Anarchists--Soviet Union--Biography
Kropotkin, Petr Alekseevich, kni︠a︡zʹ, 1842-1921
Princeton subject headings: