Unesco Source Book For Science Teaching. 

 - 1st Ed. 
 -  United Nations Educational Sci & Culturd Organization New York.  1960 
 - 221p.  22 cm. 
<br/><br/><br/>Text in English 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>PHY
<br/><br/><label>Index Terms--Genre/Form: </label><br/>P-14
<br/><br/><label>Dewey Class. No.: </label>PC-190