Mutual aid : a factor of evolution /
Kropotkin, Petr Alekseevich,kni︠a︡zʹ,1842-1921.
Beales, H. L.(Hugh Lancelot),1889-1988,editor.
Harmondsworth, Middlesex, Eng., Penguin Books Ltd.
1939.
Republished, in part, from the Nineteenth century.
"First published (Pelican books) 1939."
Cooperation.
Social groups.
Sociology.