Challand, Helen. <br/><br/>
375 things to do in science and nature, / 
by Helen Challand and Elizabeth Brandt. 
 - Long Acre, London, :  Odhams Books,  (1963) 
 - 221 p. :  col. ill. ; 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Juvenile literature