The IPN :  its structure and functions. 

 - 2nd rev. ed. 
 - Kiel:   Institute for Science Education (West Germany),   1976.  
 - 82 p. ;  21 cm. 
 -  11 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching (Elementary)--Germany (West)
<br/><br/><label>Dewey Class. No.: </label>372.35044