Collection of russian popular science texts  

 - Moscow:   Progress Publishers,  
 - 232p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Russian 
<br/><br/><label>Subjects--Index Terms: </label>Science  
<br/><br/><label>Universal Decimal Class. No.: </label>D 808.2:5(07)  / K4:2