Columbia subject headings:
Anarchism--Russia--History.
Kropotkin, Petr Alekseevich, kni︠a︡zʹ, 1842-1921.
Social Darwinism.
Sociobiology.
Solidarity.
Harvard subject headings:
Anarchism--Moral and ethical aspects.
Anarchism--Russia--History.
Kropotkin, Petr Alekseevich, kni︠a︡zʹ, 1842-1921
Social Darwinism.
Sociobiology
Solidarity.
Princeton subject headings:
Anarchism--Russia--History.
Kropotkin, Petr Alekseevich, kni︠a︡zʹ, 1842-1921.
Social Darwinism.
Sociobiology.
Solidarity.