UNESCO (Paris, France) <br/><br/>
Unesco source book for science teaching 
UNESCO 
 - rev. and enlarged ed., 2d rev. ed. 
 - Paris  c1962 
 - 250p. :  ill. , tables ;  24 cm 
<br/><br/> Appendices : p. 225-235. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching
<br/><br/><label>Dewey Class. No.: </label>507.8/U56u