Columbia subject headings:
Anarchism--Congresses.
Anarchists--Russia--Congresses.
Kropotkin, Petr Alekseevich, kni︠a︡zʹ, 1842-1921--Congresses.
Harvard subject headings:
Anarchism--Congresses.
Anarchists--Russia--Congresses.
Kropotkin, Petr Alekseevich, kni︠a︡zʹ, 1842-1921--Congresses.
Princeton subject headings:
Anarchism--Congresses.
Anarchists--Russia--Congresses.
Kropotkin, Petr Alekseevich, kni︠a︡zʹ, 1842-1921--Congresses.