Han Kim Bong <br/><br/>
On the kyungrak system 

 - Pyongyang  Foreign Languages Publishing House        1964 
 - iii, 41p.  cm. illus. 
<br/><br/><label>Standard No.: </label>58042 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biology
<br/><br/><label>Dewey Class. No.: </label>G12N61, K4;4