kniaz, d8.1..30.10 <br/><br/>
Mutual aid :  a factor of evolution / 
with a foreword by H.L. Beales. 
 - Hammondsworth :  Penguin,  [1939] 
 - Pelican books .
<br/><br/>Bibliographical footnotes. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cooperation.<br/>Associations, institutions, etc.<br/>Sociology.