The big book of how when & why   an encyclopedia of how when & why 

 - 192 pages :   colour illustrations ;   30 cm 
<br/><br/><label>ISBN: </label>9780709716655 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Children's encyclopedias and dictionaries
<br/><br/><label>Dewey Class. No.: </label>032