Iventions & discoveries 

 - 40 pages :   colour illustrations ;   28 cm 
 - Children's knowledge series .
 - Children's knowledge series .
<br/><br/><label>ISBN: </label>9833025773 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Question and answer.
<br/><br/><label>Dewey Class. No.: </label>032.02