Gumilev,L <br/><br/>
Ethnogenesis And the Biosphere 

 - Moscow:  Process Publishers,  1990. 
 - 381p.;  18 cm 
<br/><br/><label>ISBN: </label>5010020106 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Factors affecting social behavior
<br/><br/><label>Dewey Class. No.: </label>304.2  / GUM