Humphrys, L.G. <br/><br/>
Science through experience 1 

 - London:  Blond educational ltd,  1967. 
 - 127p.;  24cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science Teaching
<br/><br/><label>Dewey Class. No.: </label>507  / HUM