TY  - BOOK
AU  - Kropotkin, P'etr Alekseevich, kniaz,
TI  -  Mutual aid: a factor of evolution 
U1  - 301  22
PY  - 1939///
CY  - Harmondsworth
PB  - Penguin Books Ltd.
KW  - Cooperation
KW  - Social  groups
KW  - Sociology
N1  - Includes index
ER  -