New Unesco Source book for science teaching 
Unesco 
 - Paris  Unesco  1973 
 - 270p. 
<br/><br/><label>ISBN: </label>92-3-101058-1 
<br/><br/><label>Subjects--Topical Terms: </label>--School of Pure and Applied Sciences
<br/><br/><label>LC Class. No.: </label>Q181  / .U475 1973